Those marine mammals most adapted to a marine existence are the
a. pinnipeds.
b. sirenians.
c. cetaceans.
d. sea otters.
C
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Answer the following statements true (T) or false (F)
1. Meiosis does not occur in gametophytes. 2. Although land plants, mosses are still tied to water because of their flagellated sperm. 3. The conspicuous green patches of mosses that you see in the woods are mostly sporophytes. 4. The conspicuous green parts of ferns that you see in the woods are mostly sporophytes. 5. Woody plants and herbaceous plants are the two major monophyletic clades of the seed plants.
All cancers reflect, at the most general level, a defect in
A) DNA replication. B) the formation of mitochondria. C) cell membrane structure. D) the cell cycle.
A fertilized moth egg passes through which stages of
development before becoming an adult? I. larval II. pupal III. reproductive a. I only b. II only c. I and II d. I and III e. II and III
Peaceful uses of nuclear power may eventually be limited by:
A) the risk of criminal or terrorist activities, including theft of fissionable material. B) the risk of catastrophic accidents, such as the events in Chernobyl, Ukraine, in 1986. C) the problem of finding a continued source of nuclear fuels. D) the problem of disposing of nuclear wastes.