How do you explain a mammal like a dolphin or whale, looking so different from other mammals?
Sorry but I really don’t think that you’ve thought this one through. Like Silent-H says “They’re different animals” – and the fact that they are different doesn’t mean that they couldn’t have been ‘created’ that way. The fact that two animals that are both classified as mammals are very different in outward appearance is in no way evidence for evolution – the evidence for evolution comes from the similarities, and from the fossil record that shows how gradual changes from a common ancestor could have occurred.