Plants!

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Across
  1. 2. The flat, green, areas of a plant that are attached to the stem.
  2. 4. When a seed or spore begins to grow.
Down
  1. 1. The part of a plant that bears seeds and also has reproductive organs.
  2. 3. Typically colored segments of a flower.
  3. 4. To undergo physical changes through natural occurrences. Usually results in becoming larger in size.