I'm pretty sure that the answers are 1 and 2.
1. Cells are the fundamental unit of structure and function in living things.
2. All living things are composed of cells.
3. All cells come from preexisting cells.
Answer:
Explanation:Sometimes memories of loss or of a lost loved one may light up the reward receptors in the brain. This means that moving on or “letting go” can be much more difficult.
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.
