What kind of matter is formed when atoms of 2 or more elements bond

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Are the earth's ocean floor and continents the same age geologically? why or why not?

How can you tell the difference between rough er from smooth er?