Animal life was impossible in the Earth's early history. This is because of A) a lack of prey. B) a lack of water. C) a lack of oxygen. D) a lack of sunlight.
During early Earth's history Oxygen levels were to low about 0.1 percent of what there is today, to support the rise of animals and animal life was impossible.
Lack of oxygen made it impossible to support the rise of life during Earth's early history, billion years ago.
Animals arrived 800 million years ago and scientists found that they could not have thrived before then because of low oxygen levels
