Select the correct option regarding adaptation.

  • A
    Adaptations have evolved over a long evolutionary time.
  • B
    They are genetically fixed.
  • C
    They enable the organism to survive and reproduce in its habitat.
  • D
    All of the above.

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Match the types of niche in Column-$I$ with their description in Column-$II$.
$i$. Habitat niche$a$. In the absence of competition in the habitat
$ii$. Trophic niche$b$. Position of organism in the environmental gradient
$iii$. Multidimensional niche$c$. Physical space occupied by an organism
$iv$. Fundamental niche$d$. Level of organism in the food chain

Two or more species occupying identical or overlapping areas are known as

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