Which of the following provides molecular evidence that signal transduction pathways evolved early in the hist? which of the following provides molecular evidence that signal transduction pathways evolved early in the history of life on earth?
1)cell signaling is observed in single-celled organisms that reproduce asexually through binary fission.
2)the mechanisms of cell signaling are similar in organisms whose

Thank you for posting your question here at . Below are the choices. The answer is 4. 

1)Cell signaling is observed in single-celled organisms that reproduce asexually through binary fission. 

2)The mechanisms of cell signaling are similar in organisms whose last common ancestor lived a billion years ago. 

3)The pathways in primitive organisms, such as bacteria, are shorter than in those in advanced organisms, such as humans. 

4)Simple forms of life that have not evolved much since the origin of life, such as prokaryotes, use cell signaling.

Simple forms of life that have not evolved much since the origin of life, such as prokaryotes, use cell signaling which provides molecular evidence that signal transduction pathways evolved early in the history of life on Earth. Hope this answers the question.