Land that is available for agriculture tends to be nutrient-poor b. nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides c. grains raised for feeding livestock must be fortified and thus require additional nutrients d. cultivation of agricultural land inhibits the decomposition of organic matter e. the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.