Which of the following statements about neurotransmitters is true? . a. they're stored in synaptic vesicles in the axon. b. the effect of acetylcholine on the heart muscles is excitatory. c. the peripheral nervous system has a wider variety of neurotransmitters than the central nervous system. d. most are produced in the cytoplasm of the dendrite and migrate to the axon.

Select all the correct answers. which statements fail to meet the requirements of a scientific claim? a) in the final 100 meters of a 10,000-meter race, an athlete's speed is more strongly related to anaerobic efficiency than to aerobic efficiency. b) flowers that reflect the most ultraviolet light are more likely to attract bees and other pollinators than flowers that reflect less ultraviolet light. c) even though evidence indicates that the solar system's planets follow elliptical paths, copernicus's model involving circular orbits is true. d) the evidence supporting newton's laws of motion was accurate in newton's time, but the universe operates differently today.