(10 points) What term is used to describe Earth's early atmosphere? a
aerobic

b
anaerobic

c
oxygenated

d
unoxygenated

Give the biological term for: structures that display characteristics of living organisms only within living cells

Environmental impacts on evolution : mastery test

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures