Over time, infection with hiv can weaken the immune system so it has difficulty fighting off certain infections. these infections are called a. immunities b. opportunistic infections c. fragile viruses d. pneumonia

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.