Question

One hypothesis suggests that the Cambrian explosion was caused by the rise of predator-prey relationships. This hypothesis is best supported by an increased incidence of which of the following fossil traces?
A. hard spines on body
B. organic material
C. larger mouths
D. worm burrows

Answer 1

Answer:

The correct answer is A: hard spines on body.

Explanation:

Cambrian explosion represents a moment in the history of life in which fauna new shapes appeared showing mineralized exoskeleton. The term "mineralized exoskeleton"  refers to a hard structure that supports and protects the body,  covering the soft parts. These skeletons are made of minerals that make them harder and more resistant. The development of these structures more rigid and resistant to natural destruction was a huge triumph.

One of the principal characteristics in the Cambrian explosion was then the diversification of organisms that presented plaques, shells, and other hard parts.

Some of the first fossils in appearing are some little skeletal plaques, spines, tubs, and shells. Among these are spicules of some sponges and shells of some brachiopods.