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.

Question: What is a byproduct from the combustion of fossil fuels like coal and gasoline? Answer: nitrogen dioxide
Nitrogen dioxide is a byproduct from the combustion of fossil fuels like coal and gasoline.

Question: The properties of the alkali metals are similar to each other as expected for elements in the same what? Answer: family
The properties of the alkali metals are similar to each other as expected for elements in the same family.

Question: What do light emitters do to what you see? Answer: add frequencies

Add frequencies do light emitters do to what you see.