Whales do not actually have gills, instead they breathe through their blowhole.

I also found it interesting that a dolphin, bat, human and cat's bones all look really similar -Luke

1. Species

2. adaptation

3. Evolution

4. A

5. It shows that they are different by stating that the fossils from older layers have different characteristics than present day organisms because of evolution.

6.Fossils provide the evidence that whales might have originated from a mammal that walked on land or spent time in land and water.

7. whales do not have gills, as they breathe air through their blowhole. Fish do have gills.

8. Most likely their biological parents because their parents gave some of their traits and their offspring inherited them from their parents. Their cousins are just offspring of their parents siblings.

9. Most likely in layer C because organisms that lived further in time would be buried in lower layers than organisms that lives after themselves.