What is the main purpose of sustainable agriculture? a. to feed a growing world without damaging the ecosystem b. to produce cheap and abundant food at a high cost c. to increase farming efficiency and profits d. to rely heavily on mechanization, pesticides, and fertilizers

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey