Answer:
the covalent molecule has OA.A
It would change the charge, a neutral atom has zero charge but a proton has a positive charge. So 0 charge + 1 positive charge = 1 positive charge.
A very electronegative atoms has a strong ability of attracting electrons towards itself. As a result, it would gain electrons more than it usually has. Therefore, it would form an anion, or a negatively charge ion. These ions readily accepts electrons from the valence of other elements.
I believe it would be:
-parasites live on or on their hosts
-Parasites benefit from their hosts
-hosts are harmed by parasites
