The correct option is D. The nervous system is made up of the brain, spinal cord, sensory organs and all the nerves that connect these organs with the rest of the body. These organs are responsible for control of the body parts; they do this by sending appropriate signals to the right body part. For example, nervous system can send signal to a muscle to contract when there is a reason to do so.
Darwin's theory was based on the mechanism of natural selection, which explains how populations can evolve in such a way that they become better suited to their environments over time.
Light colored mice are more easily seen by predators and are therefore preyed upon more. Dark mice are better adapted to their environment and better able to survive and reproduce.
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Species form of a small cells under the water when the earth was contain some alive creature in it. It's a theory.
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