Answer:
1. Indohyus is an extinct genus of digitigrade artiodactyls known from Eocene fossils in Asia. This small chevrotain-like animal found in the Himalayas is one of the earliest known non-cetacean ancestors of whales.
2. While whale bones are real bones, they are apparantly a little "spongier" and less stiff than most land animal bones. Afterall, the bones don't have to hold the animal up. They just have to help it keep its shape while floating in what is pretty much a zero-G world.
3. I think they transitioned to water because they have to escaped predators so they move into the sea to survive
Step-by-step explanation: