Which describes vestigial structures and how they relate to evolution? A. Snakes have tiny internal hind leg bones, indicating that they likely descended from lizards.
B. Humans and dogs have similar bone structures in their forelimbs, indicating a common ancestor.
C. Dolphins and birds have structures that are adapted for swimming, but the structures did not evolve the same way.
D. The DNA of mice and chickens shows similar patterns, suggesting that the two species are related.
PLEASE ANSWER FAST

answer: 2

explanation:

yes

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.