Earth’s largest carbon reservoir is______ . a. the atmosphere c. seawater b. sediments and rocks d. living organisms

Ocean acidification impacts __________________________. a. fishes b. marine ecosystems c. organisms with a calcium shell d. all ecosystems

Why do you suppose plants and forests appeared in large numbers before large animals did? Several of the choices may be correct. Select the options you expect to be the strongest contributing factors.A. Animals need food, and there was none on land before plants. B. Plants were driven to land by scarce resources in the oceans, such as light and minerals. C. It was too cold for animals at first. D. Animals are more susceptible to radiation and needed more ozone in order to survive out of the water. E. The order was pure chance and could have gone either way. F. There was not enough oxygen for lungs to be effective before plants colonized land. G. The increased oxygen levels produced by land plants accelerated animal evolution. H. Plants had to change less to survive on land.

9. The Deepwater Horizon oil spill ______ the wildlife in the Grand Bay Estuarine ResearchReserve.