Which of these results when one nitrogen base replaces another in a segment of DNA? *
O an adaptation
O a feedback loop
a mutation
O
an enzyme substrate

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 is the farthest destination to date for a human spaceflight mission?

What is any method of measuring the age of an object or event in years, such as using atomic half-life?