Answer: C. Gravel
Gravel has the highest permeability.
Answer:
The cells that make up the digestive, muscular, skeletal, reproductive, and excretory systems all need oxygen from the respiratory system to function, and the cells of the respiratory system as well as all the other system bneed nutrients and must get rid of metabolic wastes.
Explanation:
The answer to your question is c, in the microwave.
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