It is the fraction of all chromosomes in the population that carry that allele.
B. I think I'm not so sure but that's my best guess.
Due to the laws of motion the airbag causes force in the other direction while the person is moving forward, thus trying to equal out the force acting apon the person to make them stay in place.
Helps feed dead things also helps clean up the earth if there was no decomposers earth would look real dirty with dead things around just piling up
Answer:
They have homologous structures because they have a common ancestor.
