QUESTION 20 Scientists try very hard to classify animals according to their aæth

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QUESTION 20 Scientists try very hard to classify animals according to their aætheric conformity O means of motility O usefulness O ecological roles O ancestry QUESTION 21 One of the most important factors leading to the Cambrian explosion was O increased solar radiation O the accumulation of methane in the fissures of the Earth. O the accumulation of carbon dioxide in the atmosphere. O the accumulation of oxygen in the oceans. O the inundation of the Earth by stellar detritus. Click Save and Submit to save and submit. Click Save All Answers to save all ans Type here to search

Explanation / Answer

Ans 20 : ancestry

Ans 21: The accumulation of oxygen in the ocean

The cambrian period is the first geological period of paleozoic era. This period shows the diversity of life in short period of time.

The factors may caused the cambrian explosion are :

More oxygen in ocean

Sea level rises

Global warming

Evolution of predators

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