Respiration is best described as a process by which A. Necessary nutrients are circulated

B. Hydrogen is used to synthesize glucose

C. Metabolic wastes are absorbed

D. Chemical energy is converted into a useable form

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Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above