Answer:
decomposes and detritivores are important because without them the amount of organic waste would overflow
Explanation:
D. ; Eukaryotic cells are bigger, younger, and more complex
B, as far as we know humans aren't from space
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.
