Question

Findings from layers dating to the Cambrian geological period show an appearance of many new organisms in addition to older forms of life. The Cambrian explosion corresponds to a time where _____.

a) Mass extinctions occurred
b) Climate change led to adaptation
c) Evolutionary radiation occurred
d) Geological stability prevailed

Answer 1

The Cambrian explosion was a time of evolutionary radiation where tremendous diversification of life occurred following a Precambrian mass extinction.

Step-by-step explanation:

The Cambrian explosion corresponds to a period in Earth's history where evolutionary radiation occurred. This event, dating back to the Cambrian period about 542 to 488 million years ago, represents one of the most significant increases in biodiversity in Earth's history. Post-Precambrian evolution was marked by the diversification of life forms and mass extinctions. Trilobites and primitive animals like sponges emerged, as well as more complex organisms resembling mollusks, arthropods, and chordates. The Cambrian period followed a mass extinction at the end of the Precambrian, setting the stage for this explosion of new life forms.