Answer
B.
Work Step by Step
Only a few control genes are needed to explain large changes among animals (B.), not 1000's (A.). While heterochrony or homeosis (C. and D.) may be part of the differences, they are only a part, not the whole.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 25 - Evolution of Development - Review Questions - Understand - Page 511: 2
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