Your heart because it uses your brain and blood
Cells are what keep you going and they are very important for our health and our immune system. the ones that help your immune system are called white blood cells, they fight off germs and sickness and it is a good and bad sign if you have alot of white blood cells
When you feel a sexual desire for someone but are unable to do this at the moment
The answer is source B because it has a listed author who is an expert and it is the governments organization website which are more reliable that a .com website. Source A does not even list the author so you do not know who wrote it could be anyone.
