The area covered by tropical rain forest is reduced by millions of hectares per year due to agriculture and logging. Which of the following best describes a likely result of tropical rain forest deforestation?
Which of the following includes the most likely change in the coloration of the beetle population after pollution and a correct rationale for the change?
Five new species of bacteria were discovered in Antarctic ice core samples. The nucleotide (base) sequences of rRNA subunits were determined for the new species. The table below shows the number of nucleotide differences between the species. Which of the following phylogenetic trees is most consistent with the data?
The biologist discovered that from 1988 to 1993, the average beak size declined to pre-1981 levels. The reversal in beak size from 1988 to 1993 was most likely related to which of the following events?
Which of the following best describes the mechanism behind the change in beak size in the finch population?
Which of the following statements might best explain the increase in average beak size in the finch population during the drought?
In the context of the Hardy-Weinberg equilibrium, which of the following factors would most likely disturb the genetic equilibrium of a population?
The enzyme pepsin functions optimally at a low pH. If pepsin is present in the stomach and the stomach’s pH increases significantly above its optimal range, what will likely happen to the enzyme activity?
The probability of obtaining a homozygous recessive individual in the offspring from a cross between two heterozygous parents is
