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B
Calcium, phosphorus
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C
Osteocytes
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D
All of the above
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Solution
The correct option is B Calcium, phosphorus Suberin is present as a covering on the bark which makes it impervious to water and gases.
Lignin is present in the cells such as chlorenchyma which makes the cell wall thick.
Calcium and phosphorus are two very important components of the bones that make the solid matrix. These two elements are very essential to the bones functionally as well as structurally.
Osteocytes are just the cells which make up the bones.
Thus, the correct answer is 'Calcium, phosphorus.'