Amphibia .
no. amphibians were
In late Paleozoic Era .
Amphibians (frogs, newts, toads and salamanders).
no
A dolphin is a vertebrate because it does not have a shell or live in a shell or for another answer he has an back bone
A lion is a vertebrate, as it has a spine, gives live birth, and suckles their young.
humans (cavemen)
monkies and birds
......fish.
It depends where you live
a lizard
All mammals and most other large land animals are vertebrate, which means "having a backbone". Exceptions would be insects and insect-like creatures, and crustaceans such as land crabs.