Trên các hành tinh khác, cây có thể đỏ hoặc vàng
Quy luật khiến cho cây cối trên trái đất có màu xanh thì cũng có thể khiến cho thực vật trên những hành tinh khác có màu vàng, đỏ hoặc xanh lục - nhưng hiếm khi xanh dương.
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