What is endosymbiosis and what is its significance in the evolutionary history of life on earth?
a) It's the process of organisms living within other organisms; it explains the origin of eukaryotic cells.
b) It's the process of organisms competing for resources; it explains the diversity of life.
c) It's the process of organisms evolving into simpler forms; it explains the origin of prokaryotic cells.
d) It's the process of organisms adapting to new environments; it explains the extinction of species.