A cactus is adapted for life with limited water. The green part of this cactus is its stem. Its stems are fleshy and
have a thick waxy coating.
What are two ways the structure of this cactus's stem helps the plant survive?
A. It prevents water loss.
B. It carries out photosynthesis.
C. It holds the plant in the ground.
O
D. It takes in minerals from the soil.

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.