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Option 2 : 2
The correct answer is 2
- Clearly, the context explains the force experienced by woodpecker
- Here, the concept of preposition is brought under consideration
- Since 'in to' is used to denote the change of form from one to another
- 'up to' is used for indicating a maximum amount
- Thus, we should replace in to with up to
Thus the correct sentence is: A woodpecker hammering away at a tree experiences forces up to 1,400 times that of Earth's gravity, or 1,400 G's.
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