PLEASE HELP, I only have one attempt

A symbiotic relationship in which one species benefits and the other is not harmed or helped -
A. Mutualism
B. Predation
C. Commensalism
D. Parasitism

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this