Which statement best explains the evolution of fins in both sharks and dolphins?
Group of answer choices

Fins evolved in sharks and dolphins because they developed adaptations for similar environments over time.

Fins evolved in sharks and dolphins because they share a recent common ancestor.

Fins evolved in sharks and dolphins because they are the same species.

Sharks and dolphins possess the same mutations in their genes.

Option A

Explanation:

Although these two organisms are similar in their external morphology, their similarities can only be explained as due to convergence since these two organism are not even closely related and do not share a recent common ancestor. Their fins have only evolved independently as an adaptation to the aquatic environments.

events in order:

1.       vishnu schist

2. zoroaster granite

3. bass limestone

4. hakatar   shale

5. igneous intrusion

6. shinumo quartzite

7. dox sandstone

8. tapeats limestone

9. bright angel shale

10. muav limestone

11. temple butte limestone

12. redwall limestone  

nonconformity

answer: the unkar group shows angular unconformity because the layers are turned at angle.

unconformity

answer: specifically the angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled. an angular unconformity occurs between the cambrian and precambrian rocks. the dox sandstone, shinumo quartzite, hakatar shale, and bass limestone have been filled.

disconformity

answer: the disconformities aremarked irregular lines between the sedimentaryrocks layers.