1. Why might it be advantageous to feed on the first and second
trophic levels? What
would be the cultural and
economic repercussions on
society if humans ate only from
the first two levels?

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

which is not a category of marine organisms