The leaves of some plants have waxy coats. This feature helps prevent water loss. Which statement describes an example of evolution? A. Thick, waxy coats become more common on a species of trees during a drought. B. Large numbers of trees with varying thicknesses of waxy coats sprout in forests each year. C. All trees have variation in their genes for thick, waxy coats. D. All plants pass their genes for thick, waxy coats to their offspring.