Cardio respiratory fitness can only be measured through exercise true or false

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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.

How do i stop staring at people if i have a staring problem?