39. Dan, who has sickle cell anemia, has Type B blood and needs a blood transfusion. Which of the following people cannot donate blood to Dan?
A. Jill who has Type B blood
B. Tyrone who has Type O blood
C. Jane who has Type B+ blood
D. Lisa who has Type AB blood

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.