Final answer:
The first trimester of pregnancy is also called the embryonic period.
Step-by-step explanation:
The correct answer is C. embryonic. The first trimester of pregnancy, which lasts from conception to about 12 weeks, is characterized by rapid cell division and development of major organs and systems. During this trimester, the baby is referred to as an embryo, hence the term 'embryonic period'. It is a critical time for the baby's development, and many major organs begin to form during this period.
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