which-of-the-following-correctly-matches-trimester-timing-to-a-key-concept

Question

Which of the following correctly matches trimester timing to a key concept?

Accepted Answer

First trimester = weeks 0–13 (critical period for teratogens); Second = weeks 14–27; Third = weeks 28–birth (~40 weeks)

Answer

First trimester = weeks 1–20 (critical period ends at week 20); Second = weeks 21–30; Third = weeks 31–40

Answer

First trimester = weeks 0–8; Second = weeks 9–20; Third = weeks 21–40

Answer

Trimesters are defined by equal 13-week divisions starting at conception, and there is no specific critical period for teratogens