Why does DNA mutations allows us to understand the traits observed in organisms

(look at the explanation below)

Explanation:

Genetics is the scientific study of inherited variation. Human genetics, then, is the scientific study of inherited human variation.A second reason for studying human genetics is its practical value for human welfare. In this sense, human genetics is more an applied science than a fundamental science. One benefit of studying human genetic variation is the discovery and description of the genetic contribution to many human diseases.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

d. groundwater flows through the subsoil and deposits minerals.