A species that plays a critical role in maintaining the structure of an ecological community and helps to determine the types and numbers of various other species in the community is known as
A. a predator.
B. the alpha species.
C. the dominant species.
D. a keystone species.
E. the primary species.
Answer: D
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As you study two closely related predatory insect species, the two-spot and the three-spot avenger beetles, you notice that each species seeks prey at dawn in areas without the other species
However, where their ranges overlap, the two-spot avenger beetle hunts at night and the three-spot hunts in the morning. When you bring them into the laboratory and isolate the two different species, you discover that the offspring of both species are found to be nocturnal. You have discovered an example of _____. A) mutualism B) character displacement C) Batesian mimicry D) facultative commensalism E) resource partitioning
Which of the following statements about the structure or composition of DNA is FALSE?
A. DNA is a double helix. B. Complementary base-pairing occurs between pyrimidine and purine bases. C. The amount of thymine closely approximates that of guanine within a particular organism. D. Each nucleotide within a DNA is separated by about 0.34 angstroms. E. Adenine pairs with thymine and guanine with cytosine.
Excessive UV light exposure causes problems with what skin protein?
a. collagen b. elastin c. keratin d. collagen and elastin e. elastin and keratin
What bone serves to anchor the tongue and muscles used for swallowing?
A. sternum B. temporal bone C. hyoid bone D. mandible