What is 1 + 1 that is = 2 and i dont now wht 2 +2=4 and thats all

How could natural selection best be used to explain the evolution of the white fur of arctic fox

Justify the following statement: “diversity should exist in the workplace.”

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?