Answer
B.
Work Step by Step
Exposure to chemicals such as drugs or alcohol have the greatest effect when the greatest amount of pattern formation is happening during development, the first trimester (B).
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 53 - Animal Development - Review Questions - Apply - Page 1133: 5
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