Describe the distinguishing organisms and major biological events associated with the following ...

Answer to q. 1

Concepts to Consider: Precambrian--bacteria, protists, fungi and simple multicellular
animals. Paleozoic era--all major groups of plants (except angiosperms) and all animal phyla
appeared; also associated with the largest extinction event. Mesozoic--diversification of
reptiles, including dinosaurs, and the appearance of flowering plants, insects, birds, and early
mammals; a major extinction event, probably due to a meteor impact, resulted in a massive
extinction at the end of this era. Cenozoic era--continued diversification of flowering plants,
birds, insects, and mammals.

Answer to q. 2

Concepts to Consider: Chloroplasts and mitochondria have their own circular DNA and
ribosomes; both are enclosed by a double membrane: prokaryote-like protein synthesis
machinery.

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