Why is the exosphere hotter than the troposphere? A. The exosphere is closer to earth's surface b. The troposphere loses its heat to the outer layers of earth's atmosphere c. The exosphere absorbs high-frequency, high-energy EMS waves d. The troposphere heats up the exosphere, causing it to have higher temperatures

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.

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm