plants
Out in the hot, dry desert where rain almost never falls, a spiky green plant still manages to stay plump and juicy inside.
A cactus stores water inside its thick, spongy stem whenever rain does fall, and a waxy outer coating keeps that water from evaporating in the hot, dry air.
It cannot drink seawater, since salt would hurt it, and it still needs some water occasionally, just far less than most plants, going a very long time between drinks.
Cactus spines are actually modified leaves, having spines instead of big flat leaves means much less surface for water to evaporate from.
plants
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