Oxytocin communicates the need for contractions during childbirth. Oxytocin is an example of what type of protein?

enzyme

motor protein

sensory proteins

signaling protein

Signaling protein

Explanation:

Oxytocin is a hormone that produces in the hypothalamus and transport to the pituitary gland which excretes it in the bloodstream. It is actually a neurotransmitter kind of hormone that's why it's a signaling protein. When it's level raises in the blood it produces strong contractions in the uterine wall during the childbirth process.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).