When blood glucose levels are high View Available Hint(s) When blood glucose levels are high The pancreas releases insulin. The pancreas releases glucose. The liver releases insulin. The pancreas releases glucagon. The liver releases glucagon.

Explanation:

Pancreas release both insulin as well as glucagon, but there release depends on different glucose levels in bloodstream. When blood glucose concentration increases, in response to it Insulin is released by the beta cells in the islets of Langerhans.

Role of insulin: i) it lower glucose levels in the bloodstream, ii) it also promote the storage of glucose in muscle, liver and other parts o the body .

While  alpha cells in the islets of Langerhans produce glucagon when glucose concentration decreases in the blood.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]