Serena is pregnant and has just been informed by her doctor that her baby's heart, eyes, hands, and feet are beginning to develop. therefore, serena is careful to avoid during this stage of development.

Teratogens and  embryonic.

Explanation:

Teratogens may be defined as any chemical or physical agent that might cause mutations in the fetus. Teratogen is harmful for both the mother and the fetus.

Teratogen must be avoided during the pregnancy. As this effect the embryonic development and might cause the abnormal growth and development of a child. The child can born with missing eyes, ears or other body parts.

Thus, the answer is teratogens and embryonic.

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