Which statement best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile.
b. A sperm is small and nonmotile; an egg is large and motile.
c. A sperm is large and nonmotile; an egg is small and motile.
d. A sperm is small and motile; an egg is large and nonmotile.
e. The sperm and egg are about the same size, but only the sperm is motile.
ANSWER: d
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