Absence of oxygen
fermentation is an anaerobic (meaning doesn't require oxygen) process
2) Cross-fertilization makes for more variation in the traits of plants, giving them immunities and resistances to weather, pests, and disease.
I think c and d is the best answers
Answer:
serotonin
Explanation:
Here is the complete question:. on average, those with the short form of the ________ transporter gene and a history of stressful experiences reported more than average symptoms of depression.
Serotonin is sometimes called the happy chemical, because it contributes to wellbeing and happiness. The scientific name for serotonin is 5-hydroxytryptamine, or 5-HT.
