Which is true of secondary succession? a. it happens after new land is uncovered. b. it begins on nonliving rock and land. c. it occurs in land and marine communities. d. it takes place on land that had no life.

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human

When fossil fuels are burned, carbon dioxide is released. how does this gas impact the environment?