Every species alive today is a transitional species, every child is the next step in evolution, you can't for the most part see the changes physically. Blue eyes come from Neanderthalis Homo a little over 10k years ago. Ancient Homo Sapiens interbred with Neanderthals. Vestigial organs and structures are a great example of evolution, the cossax bone, or tail bone, the appendix, the muscles around our ears, wisdom teeth. In the womb we got tails, we don't need the appendix cause for most of society we cook our meat, ears are in a fixed position, and our use of utensils for millennia has caused a shrinking of the jaw.
Average height maybe. Dark ages being 6' was huge I'm considered very tall at 6'8" the average height of humans has been on the rise. Go to almost anywhere with ancient structures and look at the doorways. they are hella short, I have doubts that they would make them shorter than their average selves to be inconvenient on purpose.
A fish didn't lay an egg and an amphibian came out. if this is your understanding of how evolution operates this is a problem.