Which numbers in the image represent the parts of the heart used to pump blood to the lungs?

A_ is the number of times you plan on performing a series of repetitions a. sort b. rep c. set d. joy

Why would one lymph node in the neck be swollen and not the other? what causes them to swell?

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