What do arteries do?
a. carry blood to the heart from the rest of the body
b. carry blood away from the heart to the rest of the body
c. carry blood from one part of the heart to another
d. store blood without moving it

How does the study of genetic disorders such as pku biologists understand normal alleles?

18. which statement about cancer is true?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.