The only class of antibody that can cross the placenta is
A. IgA.
B. IgD.
C. IgG.
D. IgE.
C
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Species richness increases _____
A) as we increase in altitude in equatorial mountains B) as we travel southward from the North Pole C) on islands as distance from the mainland increases D) as depth increases in aquatic communities E) as community size decreases
When did the Earth's crust form?
a. 2.9 billion years ago b. 3.2 billion years ago c. 4,600 million years ago d. 4.6 thousand years ago e. 12,000 years ago
What are the differences between metaphase I and metaphase II of meiosis?
What will be an ideal response?
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.