Evidence that cell signaling evolved early in the history of life comes from (EConcept 11.1) SHOW HINT the study of protein receptors embedded in the nuclear membrane the fossil record comparative studies of mitochondrial DNA comparative studies of ribosomal RNA the similarity of cell-signaling mechanisms in organisms that have a very distant ancestor

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A:

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.