B is the answer to your question.
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Answer:
Plants have cell walls, mammals have cell membranes.
Answer:
They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism.
Metabolic waste is the left over products of both catabolism and anabolism. This waste includes salts, phosphates, sulfates, excess substances, and nitrogenous wastes like urea which are eliminated through urine.
Answer:
Keeping the organelles inside of the cell and giving the cell structure.
Explanation:
