Clinical trials model the effects of new drugs on human society. Which of the following is a limitation of a clinical trial of new drug? a. the amount of random assignment
b. hospital costs
c. the number of test tubes
d. peer reviews

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

The fauces connects which of th following structures to the oropharynx

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.