Mainly size is what changed from prehistoric times to today.
Amniote egg
yes
reptiles
Evolutionary biologists believe that reptiles existed before mammals, and that mammals evolved from reptiles. Reptiles do not have a cerebral cortex in their brains, but mammals do, therefore, in evolutionary terms, the cerebral cortex is new.
Because it has evolutionary features of both non-avian reptiles and birds.
The amniotic egg is a key evolutionary innovation associated with reptiles. This type of egg allowed reptiles to reproduce on land, away from water, which was a significant advantage for colonizing terrestrial environments.
Evolutionary change is a process where things change over a period of time. Such as going from a candle, to a light bulb.
What can lead scientists to change an evolutionary tree?
The name for this type of rapid evolutionary change is "punctuated equilibrium."
The feathers helped retain body heat.
Not really. While there are reptiles that can change color, none of them live in the ocean.
Mutations are considered as the raw materials of evolutionary change. They are structural changes in the DNA sequence of an organism.