Use arrows and key terms such as "red blood cells," "oxygen," and "EPO" to describe how high-altitude training helps athletes improve their performance at lower altitudes.

What’s this animal (picture is tagged) and where is it most likely to live, rainforest or desert?

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis. b. the primary role of microbes on the planet involves causing disease in animals and humans. c. microbes produce vitamins in the intestines. d. microbes play a role in breaking down waste and decomposing dead organisms.

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary