Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

Q: What happens when the what cause the immune system to treat foreign organisms like normal tissues?

A: What causes the immune system to treat foreign organisms like normal tissues?
****
Q: What does Mnemiopsis er the Beroe eat?

A: What does the Beroe eat? 
****
Q: How much higher no no lower did researchers suggest sea levels would be in 2100 as compared to 1990?

A:
How much lower did researchers suggest sea levels would be in 2100 as compared to 1990?
****