AIDS is a collection of infections and cancers that occurs because HIV weakens the body’s primary system of defense, exposing ot
her systems in the body to damage. What is this primary system of defense? a the nervous system
b the circulatory system
c the respiratory system
d the immune system
I believe it's made out of cartilage. Just like our knees and noses are made out of. The mother would need to consume more calcium to aid the fetus in growing strong bones for the baby. <span />