A chromosome contains one long DNA strand.
B.
He observed 15 different finch species that originated as one ancestral bird. all differing in body shape, beak size, and mating habbits
Discontinuous variation is when a trait is seen in a population in two or more different forms and there is no continuation along a gradient. A good example that Mendel studied is flower color. The flowers were either white or purple. There was no in between color. This is caused by an allele for purple or a lack of an allele for purple, which produces no pigment, or white.
Answer:
D
Explanation:
collisions between molecules and atoms push on the container creating pressure
