What are the most common psychotherapeutic drugs? a. antidepressants and tranquilizers b. some forms of amphetamines c. controlled forms of tetrahydrocannabinol d. rohypnol or ghb?

Number and variety of living organisms includes genetic, species, and ecological types

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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.