How many years ago did invertebrates originate (in $mya$)?

  • A
    $400$
  • B
    $450$
  • C
    $1000$
  • D
    $500$

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In his experiment,$S$.$L$. Miller produced amino acids by mixing which of the following in a closed flask?

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At the time of the origin of life on Earth,which of the following was absent?

Match the following columns:
Column-$I$Column-$II$
$(X)$ Earth$(1)$ $20$ billion years
$(Y)$ Universe$(2)$ $4.5$ billion years
$(Z)$ Non-cellular life$(3)$ $3.0$ billion years

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