Biology - Ch 25 the history of life

single-celled prokaryotes had the earth to themselves for?

1.5 Billion yrs

the early atmosphere may not have been as reducing as originally postulated by haldene, oparine, miller & Urey. In light of current thinking about the composition of the early atmosphere, what is regarded as a likely place ?

near valcanoes

what was one ecological change that occurred following the Permian mass extinction

the percentage of marine predators increased

what were of the consequences of tectonic plate movements bringing previously separated landmasses together in the formation of the supercontinent of Pangea about 250 mill ago

allopatric speciation