Dizygotic twins share _______ of their genetic information
A. 25%
B. 50%
C. 75%
D. 100%
B
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In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
The second trophic level in this food web would be filled by the __________
a. beetle b. spider c. possum d. spider and possum
Which two food chains are characteristic of nearly all food webs?
a. Grazing, carnivorous b. Producing, carnivorous c. Grazing, detrital d. Detrital, producing e. Producing, decomposing
Under ideal conditions, some bacteria can reproduce as frequently as once every
A. thirty seconds. B. twenty minutes. C. twenty-four hours. D. three days.