what is the first most prehistoric animal on the show?

Answer 1

The planet earth is at least 4500 million years old. The earliest signs of life date back 3000 million years, and by 600 million years ago quite complex animals and plants existed.
The story of the backboned (vertebrate) animals - the fishes and other forms that eventually led to humans -began about 600 to 500 million years ago. The first definite fossil of a creature with a stiffening notochord along its back was a Cambrian animal called Pikaea, which was discovered in 560- million-year-old rocks in Canada. The oldest complete fish fossil so far found came from central Australia, and was a jawless, armoured fish called Arandaspis, which dates from the early Ordovician period. This small filter-feeding or mud- grubbing fish lived in shallow coastal waters over 480 million years ago.

Answer 2

what show is it your talking about. but prehistic era is not the oldest era there were many before it