In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: Which observation demonstrates that light waves travel much faster than sound waves? Answer: An exploding firework is seen before it is heard.
[A]: An exploding firework is seen before it is heard observation demonstrates that light waves travel much faster than sound waves.


[Q]: Question: The distinctive appearance of what tissue is due to polysaccharides called chondroitin sulfates? Answer: cartilage
[A]: The distinctive appearance of cartilage tissue is due to polysaccharides called chondroitin sulfates.


[Q]: Question: What do you call the hard case that surrounds the soft parts of some animals? Answer: exoskeleton
[A]:
You call the hard case that surrounds the soft parts of some animals the exoskeleton.