1. Grasslands and Savannahs can support relatively large numbers of large mammals because: A. Savannahs have more trees which allow for a greater diversity of animals and plants B

B. Grasses are CAM plants which makes them productive in low moisture environments C

C. Grasses produce large amounts of biomass and are adapted to burning and grazing

D. Grasses live and seed once and produce many edible plant parts

2. The human population curve (below) looks a bit like the letter, "J." This would indicate that humans, up to this point seem to exhibit

A, P. selection

B. K-selection

c. sigmoid selection

D. r-selection