Question 1 of 5
Which word means 'to make something worse'?
Question 2 of 5
If something is 'ubiquitous', what does that mean?
Question 3 of 5
What is the opposite of 'increase sharply'?
Question 4 of 5
If a solution is described as 'sustainable', what is a key characteristic?
Question 5 of 5
Which word means 'to prove or show something to be right or reasonable'?
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