Answer:
you inhale oxygen and exhale carbon dioxide.
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They looked and saw Rosalind Franklin's X-ray crystallography which sparked them to think about the double-helix structure, and from there, they played around with cafeteria items (forks and spoons and whatnot) to create a model that finally worked.
That is correct. Any animal that produces milk is a mammal. That is the key characteristic that defines Class Mammalia.
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The correct answer is b, antigens
