Put the embryonic/fetal characteristics in the correct order of occurrence from week 3 to week 36 of gestation. Put a comma and space between each answer choice (a, b, c, d, etc.)
a. Subcutaneous fat is present.
b. Bone marrow forms blood cells.
c. Spinal cord and brain appear.
d. Skull and jaw ossify.
e. Neural tube closes.
C, E, D, B, A
Primitive spinal cord and brain appear at 3 weeks. Neural tube closes at 4 weeks. Skull and jaw ossify at 6 weeks. Spleen stops forming blood cells and bone marrow takes over at 29 weeks. Subcutaneous fat is present at 36 weeks.
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