What do you think is the most important organ system in body? Why? Do all animals have the same organ systems?

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

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

What is the difference between a scientific hypotheses and a scientific theory?