Assuming a synapse is excitatory, which of the following would tend to strengthen a synapse? a. a drug that enhances reuptake of the transmitter b. an antagonist to the receptor c. a drug that blocks calcium entry into the presynaptic terminal d. a drug that inhibits an enzyme in the synaptic cleft that degrades the neurotransmitter

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.