Regular aerobic exercise gives an individual more endurance is a sentence that shows cause and effect. which word indicates the cause?
a. individual
b. exercise
c. endurance
d. regular

b. Exercise

If we conduct a research investigation in these given situation. More specifically, an experiment this would suggest a most probable scenario of a cause and effect situation or technically called causality. 

Here the Independent variable is the exercise 
The dependent variable is the endurance.

Hence regular EXERCISE increases endurance. 

Both are processes that are the result of stem cell division.

Explanation:  

Self- renewable and differentiation both are the processes of stem cell division. The stem cells are the specialized cells which have the potential to develop into different cell types in the body. They mainly serve as a repair system of the body. These cells undergoes through a control cell cycle and differentiation to develop into new cell type.