Because pioneer species are the first to return after a disturbance, they are the first stage of succession, and their presence increases the diversity in a region. They are usually a hardy plant, algae or moss that can withstand a hostile environment.
The process that produces oxygen
is the photosynthesis and when oxygen is released as the result of its production during
photosynthesis, it is a
by-product of splitting the water molecules. The reduction of oxygen which forms water occurs during
respiration.
The plant has the genotype ssyy. (Uncapitalized because they are recessive genes, not dominant.)
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.
