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Ingwe but it is still just a bird or ape or human
a complete thing
It will always be a complete thing. Evolution says no different.
But there are undeniably transitional forms.
To be clear, a transitional form isn't going to look like a chimera of two different animals. It simply means an organism with features specific to the ancestral form and others specific to the derived form.
Dinosaur to bird evolution is a great example of this.
Hominid evolution is another.
Furthermore, these relationships are corroborated by multiple independent lines of evidence.
Genetic, fossil, ontogeny, geological and so on.
Actually ontogeny is really an interesting example. Perhaps you've heard the phrase ontogeny recapitulates phylogeny. If not that basically means that we can see the ancestral phylogeny appearing at different stages of development.
For example, all mammals share a common ancestor with reptiles where we diverged between synapsids and sauropsids. Both sauropsids and basal synapsids have many bones that make up the jaw while mammals have only one with the rest having become inner ear bones.
We can actually observe this taking place in embryonic development.
The same bones are present in both mammal and reptile embryos but in the mammal, those bones move and alter until they become the inner ear bones.
P.S. humans are apes😉