The correct anser is: atoms.
Atoms are the smallest units of matter with the properties of chemical element. Atoms are composed of:
1. a nucleus which is positively charged and composed of protons (p+) and neutrons (n0) and
2. one or more electrons (e-) which are negatively charged and suround the nucleus.
everywhere! ponds, lakes, and rivers- salt water would be the ocean
I'll give you the first one: it's a reactant of respiration. if you want the other answers just dm me so its easier to communicate
hydrogen bonds are intermolecular, that is, occur between molecules or between different parts of one moleculeThe hydrogen bonds are pretty strong hencehydrogen bonds are only about 1/10 as strong as a covalent bond
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(jacemorris04)
Transport particles in and out of the cell