Fossill vertebrates and living vertebrates have the same number, and the same location of bones. Is this evide

Question

Fossill vertebrates and living vertebrates have the same number, and the same location of bones. Is this evidence of a common ancestor?

Answer 1

Homology and Analogy: Homology is likeness due to shared ancestry The bones in the wings of a bat and the arm of a human.
Analogy refers to non related organisms resembling each other. This is caused by a process called convergent evolution. Organisms living in the same or similar environments develop similar structures based on natural selection. They evolve to fill a niche and help the organism survive.

Answer 2

Well, fish and mammals do not have the same number & types of bones (Fish don't have limbs), but all mammals do & maybe this is what you mean. This indicates that mammals had a common ancestor. Otherwise, it would mean that different organisms randomly evolved into similar bone patterns. Of course, all vertebrates still are very similar & probably evolved from a common ancestor also.