What is the cause of the variations found in different species of living organisms?

  • A
    Due to the variation in their biological molecules
  • B
    Due to different habitats
  • C
    Due to different modes of nutrition
  • D
    Due to different evolutionary processes

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Select the correct match for $X$ and $Y$.
Column $X$Column $Y$
$(1)$ Starch$(P)$ Found in animal skeletal tissues
$(2)$ Glycogen$(Q)$ Stored food form in plants
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$(4)$ Lignin$(S)$ Stored food form in animals

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