Answer: A. Chemical signal
Explanation:
Chemical signal is the type of communication which coordinates actions between neighboring cells
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This ability originated in single cells organisms and was essential for the evolution of multicellular organisms because after a cell receives a message, it is transferred across the plasma membrane and changes are brought about within the cell in response to this message.
Epithelia are classified by the number of cell layers and the general shape of the cells
Lack of water would have an impact on the level of glucose produced hence decreasing the energy level that will finally be produced.
Answer:
-chemical composition...
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