Could you help me? I don't understand what they want I got to do and please provide me an answer

I think you're just supposed come up with like some type of mini experiment, so you could say, If I breathe in air then I will breathe out carbon dioxide and that is because Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

Explanation:

i think an experriment is what there asking for

Explanation:

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)]

it's c.us forest service