Given a scientific question, generate a correct answer to it.

Q: Who created the idea of an evolutionary tree to represent the relationships between different species and their common ancestors?

A: charles darwin
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Q: What is the basic structure that holds plants upright, allowing plants to get the sunlight and air they need?

A: stem
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Q: What atmospheric layer lies above the highest altitude an airplane can go and below the lowest altitude a spacecraft can orbit?

A:
mesosphere
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