Question

When did the first cellular forms of life appear on Earth?

Options

• 200 mya

• 350 mya

• 500 mya

• 2000 mya

Answer 1

According to the chronological account of evolution, the first cellular forms of life appeared about 2000 mya (million years ago). Some of these early cells released oxygen into the atmosphere, which was a crucial development for life on Earth.