Concept explainers
To determine: The life’s evolutionary history that was exclusively aquatic and determine when the plants as well as animals colonized the landmasses first.
Introduction: On the Earth, life first appeared about 3.8 billion years ago. The total number of individuals as well as species increased in the late Precambrian period. Three eons such as Hadean, Archean, and Proterozoic together constitute the Precambrian.
Explanation of Solution
For most of the evolutionary history, life was limited to the oceans. About 3 billion years ago, entire organisms existed in shallow seas.
The first colonization of plants as well as animals on land was in the late Silurian period that is about 420 million years ago.
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Chapter 17 Solutions
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