Why did marine creatures come before land creatures?
Endosymbiosis theory of eukaryotic cells
Why prokaryote before eukaryote?
Why did flowers evolve so late?
Why did it take so long for the O2 concentration in the atm. to rise?
Why did photosynthesis come before respiration?
Parsimony/ Occam's Razor
Various sources of fossils
Relative dating of fossils
Absolute dating of fossils
Why fossil record is incomplete
Continental drift and phylogeny
Half-life and radiometric dating