Cancer cells can travel through the blood or lymphatic vessels and form tumors at distant locations. what is this process called?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

the supermassive black hole is in the middle of the galaxy.