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Questions and Answers
What is an exoskeleton?
What is the skeletal system of vertebrates typically composed of?
What is a hydroskeleton?
What are invertebrates that lack a vertebral column referred to as?
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What is cartilage?
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What is the chemical symbol for hydrogen?
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At standard conditions, in what state is hydrogen?
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What is the most abundant chemical substance in the universe?
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How many protons does the most common isotope of hydrogen have?
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When did the formation of protons, the nuclei of hydrogen, occur according to the text?
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