"osteonecrosis is a disease caused by reduced blood flow to bones in the joints. in people with healthy bones, new bone is always replacing old bone. in osteonecrosis, the lack of blood causes the bone to break down faster than the body can make enough new bone." based on this passage and your knowledge of bone, what is one way that reduced blood flow could cause osteonecrosis? a. inadequate opening within the perforating canals b. inadequate opening within the haversian canal c. inadequate nutrients delivered to the osteoclasts d. inadequate nutrients delivered to the osteoblasts

The correct answer is option b. Inadequate opening in the Haversian canals.

Explanation:

Haversian canals are a series of tiny tubes present in the cortical bone which is the outermost area of bone. It permits nerves and blood vessels to go through it and provide blood flow to the bones.

If there is any type of inadequate opening there in Haversian canals it may cause low blood flow in the bones.

Thus, the correct answer is option B.

it enhances antibody production by t cells of the adaptive immune system.

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explanation:

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.