The theory of endosymbiosis suggests that the ancestors of mitochondria were a) formed due an error in cytokinesis. b) once free-living heterotrophic prokaryotic cells. c) parasitic cells that lived within more complex organisms. d) once free-living cells that remained joined after mitosis.

What do scientific models predict will happen to earth's temperature if current trends continue unmitigated? a. earth will heat and cool in a natural cycle b. earth will heat up and then return to an ice age c. earth will continue to warm at a rate of 0.25 c per decade d. earth will start to cool at a rate of 0.25 c per decade appex