In plants, the ability to recognize self from nonself plays an important role in fertilization, because self-fertilization will result in less diverse offspring than fertilization with pollen from another individual.

You can even be a wee bit more skank and don a dirty shirt. Unwashed underwear, however, is a no-go.

The student put down junk for answers just to finish his homework more quickly.

Muslims pray in the direction of Mecca.