What is the function of reverse transcriptase in retroviruses? it converts host cell rna into viral dna. it uses viral rna as a template for dna synthesis. it hydrolyzes the host cell's dna. it translates viral rna into proteins. it uses viral rna as a template for making complementary rna strands?

Retroviruses have an RNA genome rather than the usual DNA genome. 
They have a special enzyme called a reverse transcriptase (called RT for short) which takes the RNA genome and transcribes it back into DNA. So from your list the answer would be:
it uses viral RNA as a template for DNA synthesis.

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.