Good aerobic endurance means good cardiovascular efficiency ? true or false

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

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.

According to the national health and safety standards: guidelines for out-of-home care, what is the proper adult-to-child ratio for children younger than one year? a. one adult to one child b. one adult to two children c. one adult to three children d. one adult to four children