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SS-Bio23 19

QuestionAnswer
Cretaceous Extinction A mass extinction event that occurred at the boundary between the Cretaceous and Tertiary periods. This event, which included an asteroid impact, resulted in the extinction of the dinosaurs along with many other organisms.
Permian Extinction The greatest mass-extinction event in Earth's history. This event, in which up to 96 percent of all species on Earth were wiped out, occurred about 245 million years ago.
Cambrian Explosion A period of dramatic increase in the number of animal phyla that began about 540 million years ago, to judge by the fossil record.
phylum A category of living things , directly subordinate to the category of kingdom, whose members share traits as a result of shared ancestry.
amniotic egg An egg with an hard outer casing and an inner series of membranes and fluids that form a padding around the growing embryo. The evolution of the amniotic egg, in reptiles, freed them from the constraint of having to reproduce near water.
Created by: opentoinput
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