Broccoli, cabbages, and Brussels sprouts all descend from the same wild mustard and can still interbreed. These varieties were produced by
A) artificial selection.
B) natural selection.
C) genetic drift.
D) inheritance of acquired characteristics.
Answer: A
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Nematodes and rotifers have a body cavity that is
(a) called a coelom. (b) called a pseudocoelom. (c) completely lined by tissues derived from mesoderm. (d) both a and c.
The streamlined shape of the dolphin, seal, and other swimming animals is most important for
A. overcoming the forces of gravity acting on the animal. B. reducing drag from the water they must swim through. C. maintaining a consistent speed in the dense medium. D. reducing the mass of the animal's body.
Which processes can be carried out by consumers?
A) Only photosynthesis B) Only cellular respiration C) Both photosynthesis and cellular respiration D) Neither photosynthesis nor cellular respiration
The biological species concept has been widely adopted, but it also has some practical difficulties. Which of the following is not one of these difficulties?
A. The concept is poorly defined. B. The concept cannot be applied to extinct species. C. Many populations are allopatric. D. The concept does not apply to clonal organisms. E. Testing reproductive isolation in the lab is not always feasible.