They ARE reptiles.
no, the reptiles evolved from fish
no
No. Dinosaurs evolved from reptiles. Birds evolved from dinosaurs.
No. Gallifreyans were kind of always there. They did not evolve from anything.
It is believed that snakes evolved from lizards. Lizards are an existing group of reptiles, of course, so did not 'evolve into' anything else--they are still here. While mammals and birds evolved from reptiles, they did not evolve from lizards.
Jurassic time period
A proto-mammal called the synapsid.
fish- amphibians- reptiles- birds -mammals
Because they can generate their own body heat - reptiles cannot and need a warm environment
Marsupials, because Reptiles have never been mammals and have always had their offspring in eggs outside of them.
But they did. Specifically, birds evolved from a subgroup of dinosaurs (which were reptiles) known as theropods. There is a lot of fossil and anatomical evidence for this.