I believe that the central stalks are modified stems used for water storage and spines are modified leaves used for protection. Desert environment is normally hot and warm and therefore plants and animals have to have a mechanism to conserve water, the plants are very different such that they are often swollen, spiny, and have tiny leaves that are rarely bright green. These are as a results of adaptations to challenges of the desert.
Calcium is stored in the terminal cisternae in the sarcoplasmic reticulum of the muscle cell. Calcium ions are stored there until muscle contraction occurs. During muscle contraction, calcium ions are released in order to initiate the contraction.
Answer;
-B. 1/4 in the liver and 3/4 in the muscle cells
Explanation;
-Glycogen is the major carbohydrate storage form in animals, and corresponds to starch in plants. It occurs mainly in liver wet and muscle. Liver glycogen stores serve as a store of glucose for use throughout the body, particularly the central nervous system.
-Because of its greater mass, the whole body muscle glycogen pool is some 3 to 4 times greater than the liver pool.
