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Comprehension Check:
Answer in complete sentences.
1. How was the Earth like in 4.54 billion years ago?
2. When was our planet formed?
3. What happened to Earth in 650 million years ago?
4. What conquered the land in 450 million years?
5. What super continent began breaking up in 175 million years?
6. When did reasoning human beings cover almost the entire planet?
7. How many people are there in today's population?
