What does it mean if your white blood cell count is low?

White blood cells, also called the leukocytes, help fight off infections in your body. Normally you will have between 3,500 and 5,000 white blood cells per microliter of blood. Less than this is considered low. A low white blood cell count means your body's ability to fight off infections is compromised.

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works

No because males don’t have reproductive organs dummy