what is a cactus stem covered with
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Explanation:
Cacti have a thick, hard-walled, succulent stem – when it rains, water is stored in the stem. The stems are photosynthetic, green, and fleshy. The inside of the stem is either spongy or hollow (depending on the cactus). A thick, waxy coating keeps the water inside the cactus from evaporating.
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Answer:
Stem is covered with a thick waxy layer, which helps to retain water.
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