Describe how an allergy differs from a common cold.

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Read the article and use the information to answer the following questions. active transport in active transport, molecules are moved across the cell membrane with the of neurons electrical impulses proteins. inhibitors 3 of 3 vity

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.