In a hypotonic medium the cell expands.
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Answer: Acetylcholine.
Explanation: Acetylcholine is a neurotransmitter that mediates many sinaptic functions in nervous system. When a motor neuron releases acetylcholine at the neuromuscular junction, it binds to nicotinic receptors in muscular fibers and activates a signal cascade that will free intracellular calcium ions, causing the contraction of the muscular fibers.
Look up intelligent design. Intelligent design is an acceptance and understanding of both creation and evolution going together.
