What is unusual about endocannabinoids or endogenous cannabinoids? a. they are retrograde messengers by which postsynaptic neurons act on presynaptic terminals. b. they float in the membrane like adenylyl cyclase. c. they contain a chemical structure called catechol. d. they play an important role in the brain systems that regulate mood.

This data best supports which thesis about the causes of the french revolution? a. the first estate wanted to protect themselves from the second estate. b. the third estate resented the amount of taxes they paid. c. the first estate resented the amount of land they owned. d. the third estate thought they could overwhelm the rest of the country.