If one organism is harming the other while benefiting from the organism they are living in or on then it is a parasite.
sexual contact between individuals involving penetration, especially the insertion of a man's erect penis into a woman's vagina, typically culminating in orgasm and the ejaculation of semen.
Here is some structures that preform special functions in the cell. Cell walls, cell membrane, nucleus, ribosomes,
True you can overdose on alcohol
