Which of the following is not accounted for by cell theory? A. the growth and reproduction of unicellular organisms

B. the generation and replacement of cells in multicellular organisms

C. the origin and nature of the very first cells, from which all other cells derive

D. the existence of erythrocytes, neurons, and other cells that do not reproduce

What substance acts to prevent sudden ph changes in bodily fluids?

Which of the following forest management practices is best for reestablishing areas of forest?

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.