The nervous system is sending nerve receptors to your brain so that your arm the muscular system will throw the ball the skeletal system allows yourself to hold the ball and works with the muscles to contract and the amp system allows your body to create energy so you can throw the ball
ANSWER:
Its because mother nature tells us herself!
its just like predicting when rhinos will go instinct:
imagine people killing 2 rhinos a week or every two weeks and theres only 500-1000, you can predict that in prob 3-5 years they'll go instinct
so its just like that and they have much higher technology now that it'll just give them the answer without putting much effort into it.
~batmans wife dun dun dun....
White Blood cells or WBC's are the cells of your immune system. They are your first defense in fighting off foreign invaders and infectious diseases.
-Medical Student (College Level)
