I think its A but im not sure
Answer:
it's simple. add Not to the ffw sentences
Explanation:
just add "not" to the appropriate places.
Answer:
about 2 - 4 hours is alright
Explanation:
up to 6 hours you will feel pain in your eyes
The research question that is most effective is A. How did natural gas affect the ozone layer in 1975?
<h3>What is a research question?</h3>
It should be noted that a research question simply means the question that the researcher seeks answers to.
In this case, the research question that is most effective is "How did natural gas affect the ozone layer in 1975?". It must reflect what the researcher wants.
Learn more about research on:
brainly.com/question/25257437
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