It would be suprising to see how many similarities fish have with all other vertebrates, one of these similarities being their bony skeleton that also consists of a skull. Fish have been present for around four hundred million years as opposed to mammals who have been around for 200 million years. If you look at an embryo this is a pierce of evidence for evolution much like fossils. A fish embryo and a human embryo look almost identical with one another. There are small ridges in both of these embryos one of which develops into gills for fish and for humans this becomes the portion of the lower jaw as well as middle ear and voicebox. All animals start their earliest development from a single cell and the fact that a common ancestor is shared is a reason for multiple similarities. Although fish do not have necks an animal by the name of Tiktaalik does have a neck. This animal is technically a fish but does have many features of a tetrapod. What is so special about this animal is that it has the same pattern of bones in the forelimb as humans. A pattern of one bone, little bone, and two bones. This animal bridged the gap between land and water.
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