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One way that a cactus excretes wastes is through its breathing pores, or stomata. Guard cells on either side of the stomata's opening control the entry of gases such as carbon dioxide and the exit of gases such as oxygen. Another way is through the photosynthetic process, by which the sun and the cactus cooperate to make energizing starches and sugars. Still another way is through the exudates that the roots release into the soil. A cactus plant's waste products are considered attractive, delicious prey by the underground soil food web.

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15y ago

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