In between the two main groups of planets of the solar system, there is a vast belt of billions of asteroids. What are these asteroids mostly made of?

Which of the following is an advantage of solar energy?

How do cells grow and reproduce to maintain homeostasis?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent