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 proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms? Answer: antibodies

A: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.
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Q: Question: Which of the following questions is testable in a scientific investigation? Answer: Are cats more active at night than during the day?.

A: Are cats more active at night than during the day? of the following questions is testable in a scientific investigation.
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Q: Question: Dengue fever and yellow fever are examples of diseases caused by what type of pathogen? Answer: virus

A:
Dengue fever and yellow fever are examples of diseases caused by virus.
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