The only class of antibody that can cross the placenta is

A. IgA.
B. IgD.
C. IgG.
D. IgE.


C

Biology & Microbiology

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When did the Earth's crust form?

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What are the differences between metaphase I and metaphase II of meiosis?

What will be an ideal response?

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Enzymes are

A. broken down in reactions that require energy input. B. not needed for catabolic reactions. C. proteins that function as catalysts. D. used up in chemical reactions. E. All of these choices are correct.

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Species richness increases _____

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