Not long ago, the Sahara had a different climate. What evidence does the professor mention

Not long ago, the Sahara had a different climate. What evidence does the professor mention to support this？ Choose 3 answers.

A．Ancient pollen

B．Bones from large animals

C．Rock paintings

D．Agriculture in ancient Egypt

E．Underground water

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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