The function of a protein is determined by its shape. Proteins are composed of polypeptides in which a sequence of amino acids connected through peptide bonds. This sequence is referred to as a proteins primary structure. The shape of each protein molecule determines its function in a cell.
I don't know if this will help but I hope it dose.
Answer:
placenta
Explanation:
Nutrients and waste products are exchanged between the mother and her baby through the placenta and umbilical cord without any mixing of their blood.
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Blood exchanges carbon dioxide for oxygen in the C.) Alveoli.
