What does it mean that a hypothesis must be ‘falsifiable’ in order to be valid? A. It must have the ability to be proven wrong by some test. B. It must conform to experimental standards. C. It cannot be wrong, or the experiment would be pointless. D. It must be wrong the first time, or you did not learn anything.

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.