What determines the type of blood a person has? A) Color
B) amount of oxygen
C) thickness
D) molecules present

Which is a contraceptive method that is classified as hormonal birth control?

Which is a personal reason for using tobacco

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides. b) replication of their genomes does not involve proofreading. c) rna viruses can incorporate a variety of nonstandard bases. d) rna viruses are more sensitive to mutagens.