Answer:
Allows diffusion of sub...(true)
its found in both anim...(true)
produces en...(false)
An ion has a positive or negative charge. While a covalent bond always has no charge, meaning it is neutral.
It is the mass of one mole of the substance.
protons, neutrons, and electrons.
Rris is how u right it Mg=? Because it ask u a question and then you put the equal sign and then you put the question mark because you don't know it yet
