Members of the subphylum ____ were among the first animals to colonize terrestrial habitats and are
mostly insects.
a. Myriapoda
b. Trilobita
c. Chelicerata
d. Hexapoda
e. Crustacea
D
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After the drought of 1977, researchers on the island of Daphne Major hypothesized that medium ground finches that had large, deep beaks, survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoid
es fruits. If this hypothesis is correct, what would you expect to observe if a population of these medium ground finches colonizes a nearby island where Tribulus cistoides is the most abundant food for the next 1000 years? Assume that (1) even the survivors of the 1977 drought sometimes had difficulty cracking the tough T. cistoides fruits and would eat other seeds when offered a choice; and (2) food availability is the primary limit on finch fitness on this new island. A) evolution of yet larger, deeper beaks over time B) evolution of smaller, pointier beaks over time C) random fluctuations in beak size and shape D) no change in beak size and shape
All of the populations of different species that occupy and are adapted to a given area are known as ____
a. the biosphere b. a community c. an ecosystem d. a niche e. the habitat
Lakes become eutrophic by
A. accumulation of organic matter. B. loss of organic matter. C. circulation of water in the lake. D. free exchange of water with outside sources. E. an increase in the number of organisms.
The normal sequence of genes along a hypothetical chromosome is ABC*DEFGH, where letters represent genes and the asterisk (*) represents the centromere
A mutation event results in a chromosome in which the sequence of genes is ABC*DGFEH. This type of mutation is A) a nonsense mutation. B) an inversion. C) a translocation. D) a duplication. E) a point mutation.