In humans, the trait for tongue rolling is dominant over the trait for the inability of a human to roll his/her tongue. if a heterozygous male is crossed with a homozygous recessive female, then what percent of the offspring would be expected to have the ability to roll their tongues? a) 100% b) 75% c) 50% d) 25%

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water