The cells in the stem of a plant often have thicker cell walls than the other parts of the plant in order to A.allow more light
to penetrate through the stem. B.secrete water and oxygen through the stem. C increase gas exchange in the stem. D provide support and strength to the stem.
Catabolysis is the last metabolic resort for the body to keep itself — particularly the nervous system—functional. Protein stores, especially in muscle tissue, provide the amino acids needed for the process.
