During which stage of fetal development do the heart and lungs of a fetus become fully developed and functional? A.
first trimester
B.
fertilization
C.
third trimester
D.
second trimester

C.

Explanation:

The fetus will develop a set of lungs in the 36th week, which is the third trimester

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igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.