Nonpoint-source pollution is
a. not a serious problem in today’s oceans. b.difficult to trace because there’s so little of it. c.difficult to trace because it comes from different sources. d.easy to trace because it comes from one source.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Which of the following situations describes a adaptation for a mole? question 2 options: a mole is blind and cannot see underground. a mole is bright and attracts the attention of predator birds. a mole has a sensitive sense of smell to it find food underground.

Matched chromosomes carrying information about the same characteristics in the organism are called