The pulmonary veins carry oxygen-rich blood between the lungs and the heart.
It is actually the only vein in the boy that carries oxygenated blood. A clue to answering questions about veins is that veins are blood vessels that carry blood towards the heart while arteries carry blood away from the heart.
Answer: B: Mutation increase variety in a population.
Explanation:Mutations are changes to an organism's DNA and are an important driver of diversity in populations. Species evolve because of the accumulation of mutations that occur over time. This mutation has introduce a new allele into the population that increases genetic variation and may be passed on to the next generation.
C. Wind erosion is caused by the wind blowing loose particles of dirt and/or sand from bare and flat lands. Plant structure above ground (leaves and stem) act to shield the wind and plant roots act as anchors to hold down the soil to reduce the effects of wind erosion.