Figure 8 represents possible lines of evolution of primates. Which of the following organisms from Figure 8 are most closely related? Gibbon
Orangutan
Gorilla
Chimp
Human
Figure 8
O A Gibbon and Human
OB. Orangutan and Human
O C. Gorilla and Chimp
O D. Gibbon and Chimp

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.