The age of a rock is calculated on the basis of:

  • A
    Types of fossils present
  • B
    Number of strata present
  • C
    Amount of uranium present
  • D
    Amount of lead present

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$I.$ Wings of insects and birds are homologous organs.
$II.$ Wings of bats and birds are homologous organs.
$III.$ Wings of insects and bats are analogous organs.
$IV.$ Wings of insects and birds are analogous organs.
Choose the correct option.

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