We inhale o₂ and we exhale co₂. carbon dioxide is produced a. in the reaction that creates acetyl coa (coenzyme a) b. from pyruvate during the electron transfer steps of oxidative phosphorylation when oxygen acquires electrons and protons c. at the end of the electron transport chain d. during the formation of pyruvate

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

Eutrophication caused by human nutrient pollution.