Answer:
They test or measure something.
Explanation:
Primary research articles report on research that has been completed. Therefore, a primary research article will review and analyze studies, and will state the research question and hypotheses of the studies presented. A primary research article does not test or measure anything, but will report on studies that do.
Microscopical observations show the presence of simple in structure, abundant, and pervasive microorganisms. Researchers at the time came to the conclusion that there was a life force in the air.
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Enzymes are proteins
protein synthesis ocurs in the ribosomes
