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Answers on questions: Biology
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Ответ:
B
Explanation:
• Nerve cells (neurons) carry the message from the stimulated receptors to the correct effectors.
• A sensory neuron carries the message from the receptor to the central nervous system (the spinal cord and brain).
• A motor neuron carries the message from the central nervous system to the effector.
• This is a reflex arc.
Ответ:
Mutations happen in our cells all the time. It's actually how all humans grow and change. The vast majority of mutations are harmless. Thus, they aren't avoidable.