What kind of mutation results from the substitution of one nitrogen base for another?

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

What adaptations can prey use to avoid predation

Name the part of the the brain labeled "e".