absolute dating uses radioactive isotopes of atoms to find out exactly how old certain rocks and minerals are. In the past there were (more or less) atoms of radioactive Uranium

thinking it would be d not too sure but i think it's right

paper covers rock.

explanation:

rock only smashes scissors.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )