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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