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 origin of Hox genes and other genetic changes affecting the regulation of developmental genes
D) the movement of animals onto land
E) the accumulation of sufficient atmospheric oxygen to support the more active metabolism of mobile animals
Correct Answer:
Verified
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A) synapsids
B)
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