Here we must think about why some individuals are white and others are green.
Well, this is exactely what we have here, diversity.
Not all individual are the very same in any popupation. Everything changes and all is changing all the time.
Those are tickets to Heaven. If the weather gets hotter, sunnier and the water gets scarce the white individuals will assure the species survivel.
They can get much more sun without burning, they keep water easier than the green ones and can stand higher temperatures.
Notice the tips of the leaves, how the edges fold to form the terminal spine.
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