Health, 02.12.2020 03:20 krandall232

Ava is five weeks pregnant, and her fetus is beginning to develop three layers that will form the essential human functions. What will the ectoderm layer become over the course of Ava's pregnancy? heart, circulatory system, bones, muscles, and reproductive system
skin, nervous systems, connective tissue, and eyes
hair, fingernails, and eyebrows
lungs, intestines, and bladder

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