Battery operated device was invented to control the speed in rhythm of the human heart which professional was mainly involved in this invention

Resposta:  resposta é a

water

Explanation:

The earth is primarily composed of rock. Therefore, option B is correct.

The crust, mantle, outer core, and inner core are the four principal parts that make up the earth's structure. Each layer has a distinct chemical makeup, physical state, and potential to affect life on the surface of the Earth.

the outermost layer crust is composed primarily of granite and basalt rock. Oceanic and continental crusts are two different types. The majority of the oceanic crust is made of basalt and is denser and thinner. Granite makes up the majority of the less dense, thicker continental crust. The mantle is made of solid rock that is hot, thick, and rich in iron and magnesium. The liquid and solid portions of the core make up the earth's center.

The earth is primarily composed of rock. Therefore, option B is correct.

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According to the information, we can infer that the Independent variable: Temperature (specifically, the range of temperature). On the other hand, Dependent variable: Distribution of pikas. Additionally, Control: Pikas within their tolerance range of temperature and Constants: Other environmental factors, habitat conditions, and population of pikas.

In this experiment, the independent variable is the temperature, specifically the range of temperature. The researcher will manipulate and observe how different temperature ranges affect the distribution of pikas.

The dependent variable is the distribution of pikas. It refers to the geographical or spatial range in which pikas are found. The researcher will measure and analyze how the distribution of pikas changes in response to different temperature ranges.

To ensure test validity, a control group of pikas within their tolerance range of temperature needs to be included. This group will experience temperatures within the range they can tolerate, providing a baseline for comparison. By comparing the distribution of pikas in different temperature ranges to the control group, the researcher can determine the impact of temperature on their distribution.

To maintain validity, other environmental factors such as altitude, precipitation, vegetation, and habitat conditions should be kept constant across the experimental groups. Additionally, the population of pikas being studied should be consistent, without any significant changes in population size or genetic composition throughout the experiment. These constants help isolate the effect of temperature on pika distribution and minimize confounding variables.

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Answer: Endoplasmic reticulum, microtubules, and the Golgi apparatus

Explanation:

Look at a diagram of these two different cells

Answer:

1. Recognition of foreign molecules - Defense

2. Receptors of extracellular signals - Regulation

Explanation:

The nucleus could be removed from the ovum for the purpose of Reproductive Cloning.

To establish a recipient cell that can accept the nucleus from another cell, usually a somatic cell (body cell) of the same or different organism, the nucleus is removed from an ovum in the context of reproductive cloning.

The resulting rebuilt ovum with the transplanted nucleus can then be artificially induced to develop into an embryo, possibly leading to the birth of a cloned organism.

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The reason why the nucleus of the ovum was removed​ was that  that it will read and duplicate the DNA of the donor cell.

The technique of creating unique organisms with identical genomes, either through artificial or natural means,  can be described as cloning.  However the Cloning is the method of constructing cloned creatures from DNA fragments and cells in the realm of biotechnology.

It should be noted that this is a variety of procedures that can be used to create biological copies that are genetically identical to the original. A clone is a copy of a substance that shares the same genetic make-up as the original.

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Replication is semi-conservative because the two chains of DNA are separated by the helicase and corresponding nucleotides are placed on each chan by an enzyme called DNA polymerase

Mendel chose the pea, one of many species, to study because the plants and seeds exhibit a variety of distinctive characteristics that appear in two readily recognizable forms (e.g., seed shape is round or wrinkled; plant height is tall or short).

George Mendel, the father of genetics, chose pea plants for his genetic experiments for a variety of reasons, including

• Garden plants are simple to grow.

• Pea plant blooms are hermaphrodites, which means they exhibit traits of both sexes.

• Plants of the pure breed can be easily obtained through self-fertilization.

• Pea plants produce more quickly than other plants.

• They have a high rate of survival and remarkable disease resistance.

Gregor Mendel's research on pea plants led him to the fundamental ideas of inheritance. He came to the idea that genes are passed down from each parent as unique, paired units.

Mendel observed how parental genes separated and if they showed up as dominant or recessive qualities in the offspring. Gregor Mendel experimented with hybridization on about 29,000 pea plants. Mendel found that peas were the perfect subject since they possessed seven easily observable features that he could control. He set up two settings before starting his pea studies.

As a result, we can infer that Mendel chose the pea as the species to study out of all the others since it has a diversity of distinguishing traits in both its plants and seeds.

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The relative tonicities of the Dialysis bag solution and distilled water beaker solution is Dialysis tubing is also called Visking tubing.

(A) Dialysis bag solution - The solution leaks from the tube because the tonicity is higher outside. Dialysis tubing, also called Visking tubing, is a synthetic semi-permeable membrane tubing[1] used in separation procedures that makes it easier for small molecules to move through a solution based on differential diffusion. Dialysis tubing is frequently used in the sample preparation and cleaning of complex biological samples, such as blood or serums, as well as protein and DNA samples in the context of life science research. The principles of diffusion, osmosis, Brownian motion, and the movement of molecules over a restrictive membrane are widely illustrated in the classroom using dialysis tubing. Dialysis describes the principles and use of dialysis in a research context (biochemistry).

Beaker solution (B)-The high tonicity level in the beaker solution draws the solution in the dialysis bag to join.

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In the Triassic period, mammals and dinosaurs appear in the rock sequence.

The first mammal appear in the fossil record during the late Triassic period, which is about 225 million years ago. The Triassic period is also known as the first period of the Mesozoic era. This period started from 251.9 to 201.3 million years ago. This era is popularly known as the “Age of Reptiles” because reptiles and dinosaurs were the dominant land animals at that time and they are present in large population due to good environmental conditions and large availability of food resources. We know that dinosaur extinct due to unavailability of food and bad environment.

So we can conclude that In the Triassic period, mammals and dinosaurs appear in the rock sequence.

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Answer:

Mitosis

Explanation:

During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells.

Explanation:

i found this on internet...

Answer:

Down syndrome is a congenital condition characterized by a distinctive pattern of physical characteristics including a flattened skull, pronounced folds of skin in the inner corners of the eyes, a large tongue, and short stature, and by some degree of limitation of intellectual ability and social and practical skills. It usually arises from a defect involving chromosome 21, usually an extra copy.

The stages of bee development are egg, larva, pupa, and adult. Eggs hatch into larvae, which then transform into pupae. Finally, adult bees emerge and undergo further maturation.

The stages of bee development are:

1. Egg: The bee life cycle begins when the queen bee lays an egg in a honeycomb cell.

2. Larva: The egg hatches into a larva, which is a legless, grub-like creature. The larva is fed a special diet called royal jelly, which stimulates its growth.

3. Pupa: The larva undergoes metamorphosis and transforms into a pupa. Inside the sealed cell, the pupa undergoes various changes, developing into an adult bee.

4. Adult Bee: After completing the pupal stage, the fully developed adult bee emerges from the cell. The bee then undergoes further maturation, such as its exoskeleton hardening, wings expanding, and adult coloration appearing.

It's important to note that there are three castes of bees: queen, worker, and drone. The development process for each caste is similar, but the diet and size of the cells they are raised in differ, leading to their distinct roles within the colony.

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Answer:

Malleus

Explanation:

Malleus other words known as hammer is the bone connected to the eardrum

A cell is placed in a saltwater solution. The water inside the cell will leave the cell, decreasing the size of the cell, meaning that the saltwater solution is hypertonic to the cell (option A).

Osmosis is the net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration through a partially permeable membrane.

If a cell is placed in a saltwater solution, it means the concentration of the solute outside the cell is more than that of the cell.

As a result, water will leave the cell (higher concentration) to the extracellular salt solution. It can be said that the salt solution is hypertonic.

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A person with Down syndrome has three copies of chromosome 21 instead of two copies. An extra chromosome 21 was present in either the sperm or the egg cell (Option D).

A trisomy is a genetic phenomenon where there homologous chromosomes (instead of two) are found in diploid cells.

A person with Down syndrome carries three copies of chromosome number 21 instead of two.

In conclusion, A person with Down syndrome has an extra chromosome 21 that was present in either the sperm or the egg cell (Option D).

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The correct sequence for how your nervous system tells your muscles to move and "curl" the weight is:

Brain-spinal cord-motor neuron-muscle; option 2.

The movement of the bicep "curls" is initiated by the brain, which sends a signal down the spinal cord to the motor neuron.

The motor neuron then transmits the signal to the muscles in the bicep, causing them to contract and move the weight.

This sequence of events is known as the motor pathway and is responsible for voluntary movement in the body.

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Cell theory development has its roots in the development of the microscope and the techonology it needed, such as high powered lenses (OPTION B). This technological advance allowed people at that time, to realize how tiny, microscopic structures assemble tissues of living organisms. Which later one, would receive the name of "cells".

Answer:

a. protects the environment.

Explanation:

Using water efficiently means using it wisely and not wasting it. When we use water more efficiently, we reduce the amount of water we consume, which helps to conserve water resources. This is important because water is a limited resource, and by using it efficiently, we can ensure enough water is available for future generations.

By using water more efficiently, we can also protect the environment. Water is essential for many ecosystems and habitats, and by conserving water, we can help maintain the balance of these ecosystems. Additionally, using water efficiently can reduce the need for energy-intensive water treatment and distribution processes, which can help reduce greenhouse gas emissions and mitigate climate change.

So, using water more efficiently helps protect the environment but also helps conserve water resources for the future.

Answer:

A dilated vessel with decreased blood volume

Explanation:

The force that blood applies to the blood vessel walls is known as blood pressure. The amount of blood flowing through the arteries and the vessels' resistance to the flow of blood both have a role in determining it. A dilated vessel is one that has grown in size, which reduces the blood flow resistance and, as a result, lowers blood pressure. Blood pressure will fall as a result of a reduction in blood volume because there will be less blood in the vessels to exert its normal force on the vessel walls.

Therefore, the lowest blood pressure would result from a dilated artery carrying less blood. It's important to note that although a constricted channel with less blood volume would also result in low blood pressure, it would not be the lowest scenario. Higher blood pressure than the first option would result from both a constricted vessel with increased blood volume and a dilated vessel with increased blood volume.

Im answering here to not only agree to the other person answering before me. I am also here to allow you to post brainliest for the other guy

Answer: a

Explanation:

Answer:

An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated.

Explanation:

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The month that is carrying capacity that is most likely to be limited by water is: c. September.

This is due to the graph's apparent abrupt dip in water level around September, which indicates a decrease in the amount of available water resources.

As a result, the low water supply during this month may limit the carrying capacity, which refers to the maximum number of people that an area can support sustainably.

Therefore the correct option is C.

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Answer:

A

Explanation:

The history of scientific discovery of climate change began in the early 19th century when Ice Ages and other natural paleoclimate changes were first suspected and the natural greenhouse effect was first identified.

Evidence of past climate includes:

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Relaxation begins when nerve signals quit stimulating the synaptic knob from releasing acetylcholine. Acetylcholine dissociates from its receptor, and no new molecules of acetylcholine are released.

Tropomyosin moves back into position blocking active sites, and no more contractions can occur. Finally, the muscle fibre returns to its resting length.

What causes sarcomere relaxation to begin?

When the nerve is no longer being stimulated, relaxation takes place. The connection between actin and myosin is then broken by calcium being injected back into the sarcoplasmic reticulum. The muscle relaxes when actin and myosin revert to their unbound condition.

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Relaxation begins when nerve signals quit stimulating the synaptic knob from releasing acetylcholine. Acetylcholine dissociates from its receptor, and no new molecules of acetylcholine are released.

Tropomyosin moves back into position blocking active sites, and no more contractions can occur. Finally, the muscle fibre returns to its resting length.

When the nerve is no longer being stimulated, relaxation takes place. The connection between actin and myosin is then broken by calcium being injected back into the sarcoplasmic reticulum. The muscle relaxes when actin and myosin revert to their unbound condition.

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The test tube that can be seen to contain an artificial cytoplasm is test tube 3

Given that;

Test Tube 1 | Orange | Red

Test Tube 2 | Yellow | Orange

Test Tube 3 | Yellow | Yellow

Test Tube 4 | Green | Green

The fact that the pH of the mixture remained steady after the addition of HCl shows that the unidentified solution in Test Tube 3 buffered the addition of the acid and kept it there. This behavior is in line with the existence of synthetic cytoplasm, which is intended to keep the pH in check so as to mimic the natural cellular environment.

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Most articles pass right through the atom, this means that most of the atom is an empty space.

An atom is described as a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons.

Protons and neutrons make up the core nucleus of an atom, which is encircled by an electron cloud. In relation to the size of the atom as a whole, the nucleus is exceedingly small.

As a result, the electrons surrounding the nucleus are the primary target of interactions when particles or even light pass through an atom. The majority of the atom's remaining space, which includes the nucleus, is vacant.

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The three basic cellular structures that every cell needs are the cell membrane, the cytoplasm, and the genetic material. The cell membrane functions to regulate what enters and exits the cell, the cytoplasm provides a medium for cell organelles to function in, and the genetic material contains the instructions for cell function and replication.

Cell Membrane: The cell membrane is a thin, flexible barrier that encloses the cell and separates its internal environment from the external environment. It is made up of a phospholipid bilayer and is selectively permeable, meaning it regulates what substances enter and exit the cell.

Cytoplasm: The cytoplasm is a gel-like substance that fills the inside of the cell and contains various cell organelles, such as mitochondria, ribosomes, and the endoplasmic reticulum. The cytoplasm is important because it provides a medium for the organelles to function in and facilitates the movement of materials within the cell.

Genetic Material: The genetic material of the cell is the DNA that contains the instructions for cell function and replication. In prokaryotic cells, the genetic material is found in the cytoplasm, while in eukaryotic cells, it is found in the nucleus.

In summary, every cell needs a cell membrane to regulate what enters and exits the cell, cytoplasm to provide a medium for cell organelles to function in, and genetic material to contain the instructions for cell function and replication.

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Answer: B, D

Explanation: BrainEList me