And at the end of the day, we have a fossil succession which demonstrates that all fossils are transitional and make up this larger order of fish>amphibian>reptiles>mammal/bird, and cambrian > Devonian> carboniferous > Triassic/Jurassic, with fish/amphibians of the devonian (ex. Tiktaalik), amphibian/reptile transitions in the carboniferous/permian (ex. Frogamander), reptile/mammal transitions in the permian-triassic (ex therapsids) and reptile/bird transitionals in the jurassic (ex archaeopteryx and other theropod/bird hybrids).
And then further there is a fossil succession in plants and of course other invertebrates and basically anything that can produce fossils falls within this order.
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People who deny evolution or are young earth Creationists, typically just try to deny all of this information. But for those who actually study the topic, it's really not even remotely questionable. It's as simple and as well understood as concepts such as the sun being hot.