Fossil $X$ is considered to have evolved before fossil $Y$. This is true if:

  • A
    $Y$ are vestigial structures that are homologous to the structures of $X$.
  • B
    $Y$ is structurally more complex than $X$.
  • C
    $Y$ is in a better state of preservation than $X$.
  • D
    $X$ is found in lower sedimentary strata than $Y$.

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