Question

who/which is the frist animal in the world ?​

Answer 1

Answer:

For some four billion years, no life existed on Earth more complex than a simple cell. Then, and for reasons still unknown, about 575 million years ago multicellular life forms suddenly began to multiply. That event, named the Avalon explosion, happened after the planet left behind the frigid phase of the Cryogenian Period to enter the Ediacaran, which lasted from 635 to 542 million years ago.