During the embryonic stage, a hollow ball of cells is known as a
A) morula. B) larva. C) blastula. D) gastrula. E) chorion.
C
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Who invented DNA profiling?
A) Godfrey Hardy B) William Weinberg C) Sir Alec Jeffreys D) Linus Pauling
If the United States exports wheat to foreign countries that levy tariffs on wheat imports, the probable result is that the price of wheat will
a. fall in foreign countries. b. rise in the United States. c. rise in foreign countries. d. rise faster in the United States than in foreign countries.
Which sort of interaction is harmful to one species but beneficial to the other? List at least three. What will be an ideal response?
Which of the following affects the rate of
diffusion through a selectively permeable membrane? I. concentration gradient II. temperature III. molecular size a. I only b. II only c. I and II d. II and III e. I, II, and III