Which of the following was probably the least important factor in bringing about the Cambrian explosion?
A) the emergence of predator-prey relationships among animals
B) the accumulation of diverse adaptations, such as shells and different modes of locomotion
C) the movement of animals onto land
D) the origin of Hox genes and other genetic changes affecting the regulation of developmental genes
E) the accumulation of sufficient atmospheric oxygen to support the more active metabolism of mobile animals

Question

Quizplus · Accepted Answer

The movement of animals onto land did not occur until much later in evolutionary history, long after the Cambrian explosion. Therefore, it is unlikely to have played a significant role in bringing about the Cambrian explosion.

Which of the Following Was Probably the Least Important Factor