Which of the following is true about earth's freshwater, air, soil and trees? a. although these resources are renewable, they present very few benefits for humans. b. although these resources are renewable, their present benefits can be reduced if used carelessly. c. although these resources are nonrenewable, humans don't have to worry about conserving them. d. these resources are nonrenewable, so humans must stop using them if they are to survive.

Transpiration is the evaporation of water from

Which of the following is an example of a non-falsifiable hypothesis? a. there is a teacup orbiting the milky way galaxy. b. there is no life on mars. c. the human species started in africa. d. humans cannot live without the amino acid methionine

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.