What type of substances are lignin and chitin?

  • A
    Proteins
  • B
    Lipids
  • C
    Disaccharides
  • D
    Polysaccharides

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Vitamin $D$ is also known as:

Identify the odd one out.

The chemical name of Vitamin $D$ is . . . . . . .

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What is the valency of carbon?

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