Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?
1)Protostomes invade terrestrial environments.
2)Cambrian explosion occurs.
3)Deuterostomes invade terrestrial environments.
4)Vertebrates become top predators in the seas.
A) 2 → 4 → 3 → 1
B) 2 → 1 → 4 → 3
C) 2 → 4 → 1 → 3
D) 2 → 3 → 1 → 4
E) 2 → 1 → 3 → 4

Question

Quizplus · Accepted Answer

The Cambrian explosion (2) occurred before the rise of vertebrates as top predators in the seas (4) and before the invasion of terrestrial environments by deuterostomes (3) and protostomes (1). The correct sequence is 2 → 4 → 1 → 3. Choice C is the only one that follows this order.

Fossil Evidence Indicates That the Following Events Occurred in What