HIV disables the immune system by
a. destroying helper T cells.
b. activating production of B cells.
c. blocking the action of macrophages.
d. destroying the production antibodies.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

multiply it by 5 in order for you to understand i cant give an exact answer.