Which of the following describes natural selection? a. a population of mammals lives near the water, water levels rise and the habitat becomes swampy, the animals have trouble moving in the water, the population changes to a shorter-legged type so they can move more easily in the water b. a population of mammals lives near the water, water levels rise and the habitat becomes swampy, the act of swimming shortens the legs of the mammals, the offspring of the mammals have shorter legs c. water levels rise and a habitat becomes swampy, a population on high ground observes the change, individuals with shorter legs migrate to the area d. a population of mammals varies in the length of their legs, water levels rise and the habitat becomes swampy, the individuals with shorter legs are better able to swim to food, the population evolves to become shorter-legged 1 points

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. threat method number of species that benefit number of years to see benefit habitat fragmentation reforestation 450 8 introduced prey species biological augmentation 150 2 which statement is an accurate explanation of the information in the table? a. biological augmentation would benefit only a few species because it is typically not very effective. b. biological augmentation would take less time to be effective because it targets the majority of prey species. c. reforestation would take the longest time to be effective because trees take several years to grow. d. reforestation would not benefit many species because most forest species live on the ground.

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has