Compounds can also be such as water and carbon dioxide. help??
the answer choices are pure substances, elements and atoms.

Order the following from smallest to largest atom, electron, quark, proton, neutron, molecule, nucleus

What is the relationship of air masses and the temperature of oceans?

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.