The nature of Life (The origin of life).

Are animals consumers or producers?

• consumers

• producers

When was Earth formed?

• 4.6 Billion years ago

• 4.6 million years ago

• 4.5 Billion years ago

• 4.6 million years ago

How do we know that the first cells were able to live without oxygen?

• we just do

• there was little or no oxygen in the atmosphere

• there was plenty of oxygen