HOW these things came about no one on earth knows. Again, there is no proof these organisms the bones came from evolved. From or to. Fossils do not prove evolution. They can show that a bone or bones were part of an organism which died.
An organism that lived and died. And, we can say *when* that organism lived and died. And we can then compare when it lived and died to when *other* organisms llived and died. We can then look at similarities over time and place to determine which organisms are related to which other organisms.
And *that* does say that populations of organisms change over time: and that is evolution.
A *single* fossil does not prove evolution. But the whole collection of fossils, along with genetics, does.
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