Erosion becomes a constructive force when A) It deposits what it is carrying somewhere else (deposition)

B) it removes the top layer to let the new underneath be fresh

C) It is removes the bad and leaves only the good

D) It takes junk out of your way

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

How did the miller-urey experiment impact the way scientists think about the origins of life? use what you know about the miller-urey experiments to discuss the factors needed for life to arise, and speculate on whether life could arise on another planet.

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.