What allows us to stand upright and keeps us from falling through the ground? a. while gravitational force pulls us down, the opposing force from the ground pushes up and balances out the two forces c. while gravitational force pulls us down, the ground is pulling us down too b. the force of gravity is stronger than the force of the ground pushing up on us d. the force of the ground pushing up on us is stronger than the force of gravity

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.