How do two hydrogen atoms bond to form a molecule? 1 each hydrogen atom shares an electron to form a covalent bond

2 each hydrogen atom transfers an electron to form an ionic bond

One similarity and one difference between an element and a mixture of elements

Who examines and coordinates the cleanup of polluted sites?

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?