what are mutualism, commensalism, parasitism, and predator-prey?

Explanation:

Mutualism - two organisms that benefit from each other

Commensalism - one organism benefits, one isn't harmed

Parasitism - a parasite benefits from and harms a host

Predator-Prey - a predator (animal that kills another for food) kills a prey (the animal it likes to eat) and eats it

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.