We can see that the best revision is: Wetlands used to be thought of as horrible places. Now people realize wetlands are homes for birds. Wetlands are important for the environment.
Revision of a sentence or passage actually refers to the improvement of that sentence that is done in order to create another version of the sentence but yet still the same message.
The best revision here is:
Wetlands used to be thought of as horrible places. Now people realize wetlands are homes for birds. Wetlands are important for the environment.
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