What is the most likely explanation for the very low fecundity of species such as whales, humans, and elephants?
A. All listed
B. Density-dependence
C. Low probability of offspring survival
D. High investment in parental care
E. High mobility
Ans: D. High investment in parental care
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The salivary amylase gene (AMY1) is present in two diploid copies in chimpanzees. Humans are known to have between 6-15 copies, an adaptation that is thought to be related to the high-starch diet of humans
This difference among humans is an example of A. G banding. B. copy number variation C. a simple translocation. D. a reciprocal translocation.
In competition between P. caudatum and P. bursaria, neither species goes extinct. This is because they don't utilize the same resources. This conclusion is generalized as the
A. extinction theory. B. the frequency of competition hypothesis. C. competition hypothesis. D. coexistence theory. E. competitive exclusion theory.
Buttress roots help trees obtain oxygen from flooded soil
____________________ Indicate whether the statement is true or false.
Normal cells stop their division when it gets too crowded, which is celled ______ inhibition.
a. density-independent b. density-dependent c. contact inhibition d. none of the above