About 220 Million Years Ago,mammals Evolved from ____________________

Q67: The first single-celled prokaryotes evolved 3 billion

Q68: We know that whales evolved from the

Q69: Mass extinctions remove dominant groups of organisms

Q70: A gene that controls a battery of

Q71: Evidence that the Cretaceous mass extinction was

Q73: Closely related phyla are grouped together into

Q74: The Cambrian explosion resulted in the evolution

Q75: Oxygen was one of the original gases

Q76: Scientific advances in the study of evolutionary

Q77: The preserved footprint of a Neanderthal is