Multiple Choice
Which of the following was the least likely factor causing the Cambrian explosion?
A) the emergence of predator-prey relationships between animals
B) the accumulation of diverse adaptations, such as shells and different modes of locomotion
C) the movement of animals onto land
D) the evolution of Hox genes that controlled development
E) the accumulation of sufficient atmospheric oxygen to support the more active metabolism of mobile animals
Correct Answer:

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Correct Answer:
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