Scientists may use fossil evidence to support the theory
that domestic dogs are related to wolves. Which of the
following would be considered the most valid evidence
to support the argument that wolves and dogs
descended from a common ancestor?
a. DNA comparisons of dogs and wolves
b. Anecdotal evidence of how dogs and wolves interact
with each other in the wild.
C. Examination of the niche that dogs and wolves fill in
an ecosystem.
d. Mating patterns in dogs and wolves.

Only a. DNA comparisons of dogs and wolves is valid evidence.

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.