What effect do competition and predation have on population size?

If animals are fighting for food (competition) they'll be forced to kill each other or go hungry. Predation is simply when animals kill things for food. So basically it's just a whole lot of killing.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !