Dopamine is a chemical released by neurons to send signals to other nerve cells. the brain includes several distinct dopamine pathways, one of which plays a major role in reward motivated behavior.
smoking is a habit, in a habit there is the cue, routine, and reward. with smoking the cue can be different things, most commonly stress or anxiety. the routine how you react to those cues, the reward is the chemical 'triggers' that are pulled inside you're brain leaving you feeling calm, happy, or relieved, etc.
Kidney, ureter bladder and urethra
Factories and automobiles
I would have to say <span>She should place one flower in a similar container, but not pump carbon dioxide into it. She should also give each plant the same amount of water. but im like 70% sure about this sorry if im wrong:)</span>
a)the number of species on Earth or b)the number of individual organisms on Earth
