GK: Which creature on earth can clean its ears with a 21-inch long tongue?

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Question 1: Which creature on earth can clean its ears with a 21-inch long tongue?

Answer: Giraffe 

Question 2: Which animal does not like to be alone?

Answer: Dolphin

Question 3: Which animal's milk is consumed by more people around the world?

Answer: Goat

Question 4: In what form does the signal flow in fiber optic communication?

Answer: Light wave