Answer: high and low
Explanation: high and low
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.
Answer that does not describe the structure of an atom: The electron clod is a small and compacted space around the nucleus.
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Around 4.1 billion years ago the first single celled organism appeared
