B7C&D

B7C The diagram shows light- and dark-colored beetles that live on a tree. Which result is most likely to occur to the beetle population due to predation over time?

• The number of light-colored beetles in the population will increase.

• There will be more dark-colored beetles than light-colored beetles

• The number of light-colored beetles will decrease

• The dark-colored beetles will move to a different type of tree.

B7C The quiver tree grows in desert areas in southern Africa. In recent decades average temperatures have been rising in southern Africa. Scientists predict that this warming trend will continue. Quiver trees in the hottest parts of their range near the equator are dying, but quiver trees at high elevations or in parts of the range that are farther from the equator are growing and reproducing. Which of these best explains what is happening to the quiver tree population in southern Africa?

• Individual quiver trees are unable to adjust to the rising temperatures, and only those in cooler parts of the range will survive.

• The quiver tree species is unable to survive rising temperatures throughout its range . The species is likely to undergo rapid extinction

• Individual quiver trees can quickly adapt to rising temperatures. Individual trees will change their method of seed dispersal in cooler parts of the range.

• The quiver tree species will survive by producing offspring suited for warmer temperatures.

B7D The green frog (Lithobates clamitans clamitans ) is found in many parts of the United States. The table contains some information about this frog. Why does the ability to lay 1,000 to 5,000 eggs increase the fitness of the species L. clamitans clamitans?

• It increases opportunities for offspring to compete for limited resources

• It increases the probability that some offspring will survive long enough to reproduce

• It increases the probability that moving water will promote gene flow from one population to another

• It increases the chance of the recombination of alleles, leading to genetic drift in the population

B7D Which condition is essential for natural selection to result in a new species?

• Unlimited resources

• An inherited variation

• A static environment

• A long life span