Which of the following is (are) correct statements regarding vitamin C?
a. Large doses of the vitamin are not as well absorbed as smaller doses.
b. Most animals can make this vitamin and it is only essential for humans and a few other species.
c. All healthy adults require between 75-90 mg/day
d. All of the above Both B and C are correct

D

Explanation:

Vitamin C is one of the vitamins that humans can't produce in their liver. They need this vitamin from the external environment in the form of food. About 75- 90mg/day is it's the normal dosage. So, option D is correct.

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)]