Based on the $\underline{x}$ of pollen grains,pollination can be divided into $\underline{y}$ types.

  • A
    $x-$source,$y-3$
  • B
    $x-$size,$y-2$
  • C
    $x-$structure,$y-3$
  • D
    $x-$color,$y-2$

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