I would say almost all types of muscles. Skeletal, cardiac, or smooth, they all need neurons. Without them, it could cause flaccid and spastic paralysis, or other types of diseases.
Which activities? I want to say the nucleus as it is the control center of the cell, but this is a vague question.
Answer: Chlorophyll is a substance inside the chloroplasts which is used to absorb light from the sun in order to provide the plant with energy to photosynthesise
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Answer: Hey I will gladly help. I can't right now because you did not say what each pond is like. If you fix it, I will do it for you
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