Histamines are chemicals that your body makes up to help get rid of something that’s bothering you. in relation to allergies, histamines help you get rid of by coughing, sneezing, itching, etc.
Explanation: Chemicals
There are four primary chemicals in the brain that effect happiness: dopamine, oxytocin, serotonin, and endorphins. By designing gamified experiences that activate these chemicals, you can increase your users' happiness and loyalty.
Answer:
Explanation:
1 HIV/AIDS
2 Sexually transmitted diseases (STDs)
