Which of these Natural Sciences is the most intellectually demanding?

Physics-Man
Which of these Natural Sciences is the most intellectually demanding?
Chemistry
Vote A
Which of these Natural Sciences is the most intellectually demanding?
Geology
Vote B
Which of these Natural Sciences is the most intellectually demanding?
Physics
Vote C
Which of these Natural Sciences is the most intellectually demanding?
Astronomy
Vote D
Which of these Natural Sciences is the most intellectually demanding?
Biology
Vote E
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GirlGuy
Which of these Natural Sciences is the most intellectually demanding?
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