The integumentary system is made up of A. the skin, nails, and hair.
B. just the skin.
C. just the nails and hair.
D. just the skin and nails.

By 2 weeks after fertilization the morula has implanted into the uterine lining and transforms into a(n) . this time is when the , or the organ that will provide nourishment to the fetus by exchanging nutrients and waste products, begins to develop.

Think of all the communities that you are a part of and write them in the space provided.

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