Amniotes appeared approximately Blank______ million years ago.Multiple choice question.100200300400

The first animals arose on Earth approximately ______ years ago.Multiple choice question.570 million900 million140 million750 million

The first ancestors of humans showed up about ______ years ago.A.10,000B.65 millionC.1 millionD.4.5 billio

Our current estimates state that the Earth is about Blank______.Multiple choice question.100 billion years old4.5 billion years old4.5 million years old100 million years old

It was in the primitive oceans that life began almost ___________ billion years back.A 1 B 3.5 C 2.5 D 6

Homo sapiens first appeared approximatelyChoose 1 answer:Choose 1 answer:(Choice A)   50,000 years agoA50,000 years ago(Choice B)   200,000 years agoB200,000 years ago(Choice C)   800,000 years agoC800,000 years ago