27.How do mass extinctions differ from background extinctions? Mass extinctions

Question

27.How do mass extinctions differ from background extinctions?

Mass extinctions occur over a longer period of time than background extinctions.

30.Are all the theropod dinosaurs extinct?

Mass extinctions cause a larger proportion of organisms to go extinct than background extinctions. Mass extinctions, but not background extinctions, are generally caused by competition. Mass extinctions typically result from Hox gene mutations, and background extinctions typically result from changes in weather patterns.

Mass extinctions occur over a longer period of time than background extinctions.

30.Are all the theropod dinosaurs extinct?

No, theropods are a polyphyletic group that includes birds. No, theropods are a monophyletic group that includes birds. No, theropods are a paraphyletic group that includes birds. Yes, all the theropod dinosaurs died out 66 million years ago.

Explanation / Answer

27)

A) Mass extinctions cause a larger proportion of organisms to go extinct than background extinctions.

Explanation :The main difference between background extinction and mass extinction is that background extinction is caused by the poor adaptation to the ongoing changes in the environment whereas mass extinction is caused by the exposure to harsh conditions during a short period of time

30)

C) No, theropods are a paraphyletic group that includes birds.

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