Which of the following eat producer organisms in a food chain? A. quarternary consumer
B. tertiary consumer
C. primary consumer
D. secondary consumer

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic