Answer:
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Explanation:
Examples of natural systems include: real number system, solar system, and planetary atmosphere circulation systems.
Natural physical systems include the solar system and an animal's digestive system. Human-made physical systems include mechanical systems, optical systems, electrical systems, and combinations of these. The names of these systems come from the type of energy they use.
Answer:
Peptide bond
Explanation:
Peptide a short chain of amino acid; therefore the bond present is called peptide bond
C. membrane bound organelles
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D is the answer to this question hope it helps
