Answer:
According to this hypothesis, viruses evolved early in Earth's history from fundamental replicative molecules that formed in the “primordial soup” as the planet began cooling. These molecules also led to the evolution of cellular organisms—the viral hosts—either in parallel or at a later stage of evolution.
That would have been 3 or so billion years ago, early in earths history.
Explanation:
Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned.
C membrane with the help of a channel protein
Valence electrons would be found in the outermost shell of atom models!
Hope this helps (:
