Question

which of the following statements is true of the period of the embryo? a it is a time of cell division and travel toward the uterus for implantation. b it is when teratogens can be most harmful. c it is a time of major growth of the structures that have already been formed. d it is a time of travel from the ovary to through the fallopian tubes.

Explanation:

• Option A: Cell division and travel toward the uterus for implantation occur during the germinal period, not the embryonic period.
• Option B: The embryonic period (weeks 3 - 8 after conception) is when teratogens (agents that can cause birth defects) can be most harmful. During this time, major organs and body systems are forming.
• Option C: Major growth of already - formed structures occurs during the fetal period.
• Option D: Travel from the ovary through the fallopian tubes occurs during ovulation and fertilization (pre - embryonic events).

Answer:

B. It is when teratogens can be most harmful.