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what is one way that changes can occur in a dna sequence?
o as a result of shared common ancestry
o through mistakes during dna copying
through advancements in molecular biology
o as a result of an extensive dna analysis

DNA changes occur primarily because of natural errors that occur during the DNA replication process. They also can happen when one or more environmental factors act on the DNA. Jul 24 2019

Explanation:

A genetic code shared by diverse organisms provides important evidence for the common origin of life on Earth. That is, the many species on Earth today likely evolved from an ancestral organism in which the genetic code was already present.

Explanation:

--as a result of shared common ancestry

--through mistakes during DNA copying

through advancements in molecular biology

--as a result of an extensive DNA analysis

helicase, i think thats it