The number of trout in a lake drops when the lake is polluted. the trout population later increases, but the allele frequencies are different. what does this situation represent? a. genetic drift b. artificial selection c. speciation d. biodiversity

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?

Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus