which fetal development occurs during the second trimester?\nbones begin to harden.\nthe roof of the mouth…
which fetal development occurs during the second trimester?\nbones begin to harden.\nthe roof of the mouth forms.\nthe eyes can sense changes in light.\nthe heart and circulatory system begin to develop.
Answer
Answer:
A. Bones begin to harden.
Brief Explanations:
The second trimester (weeks 13-27) is when fetal bones ossify (harden). The roof of the mouth forms in the first trimester (weeks 6-8), light sensing by eyes starts in the third trimester, and the heart/circulatory system begins developing in the first trimester (week 3). Thus, bone hardening is the correct second-trimester event.