nLiving things are all very different
nThe fossil record shows that “phylum-level” differences appear at the lowest levels, i.e. in the Cambrian period. This has been referred to as “the Cambrian explosion.”
n There is no
fossil evidence connecting Cambrian animals to
organisms preceding
them. There is no long history of
gradual divergence
predicted by Darwin
n The Cambrian
explosion gave rise to most of the animal
phyla alive today,
as well as some phyla that are now extinct