a drug that mimics the effects of a particular neurotransmitter or blocks its reuptake is called a(n): (2 points)

glutamate

steroid

antagonist

agonist

opiate

*30 points + brainliest answer* gravity is pulling an object into the sun. the closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. a line graph plotting the speed of the object against time would have which shape? a: straight line of positive slope b: curved line that slopes upward c: curved line that slopes downward d: straight line of negative slope