Glycogen is a polysaccharide used for energy storage by

The liver and muscles.

Explanation:

Liver and muscles store glucose, in response to insulin hormone, in a form of glycogen for use during starvation period. When glucose is too much in the blood, insulin is secreted by islets cells in the pancreas. Glycogen synthesis is then initiated in liver where it is stored.

Glycogen is a polymer of glucose just like starch in plants. 60% of glucose from glycogen store is used up by the brain as its only source of energy.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.