Cacti have many evolutionary adaptations for living in extreme drought Championship Material shirt. The average cactus has no leaves at all, because leaves transpire or “breathe” through pores on their undersides, and a plant with leaves loses a lot of water that way. Instead, a cactus uses the strategy of no leaves, just its bare stem, what looks like the body of the cactus. The cactus stem has green chlorophyll to be able to capture sunlight and convert it to sugars, and is covered in a thick waxy coat of waterproofing material, so it hardly loses any water at all, while still photosynthesizing.
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If you put a cactus in a cool, moist area, it would likely Championship Material shirt , because that is not what it is adapted to. Too much water will make the cactus basically turn brown, develop soft spots and rot before it can even reproduce. Other plants in a cool-moist climate will outcompete the cactus (that is, produce more surviving offspring) every time. But put a cactus in a desert and now the cactus can survive and reproduce where other plants cannot. Its water-conserving adaptations mean that when other plants die from heat and drought, the cactus can survive, and not only survive but flourish. Surviving to reproduce is what evolution is all about. A milder desert might allow a variety of other drought-tolerant vegetation besides cactus, and these might crowd out the cactus if conditions are mild enough, but as the environment gets drier and hotter, the cactus becomes a superior competitor. The other plants die off, it survives. It reproduces, and only the most viable and hardy of its offspring survive. Over time, the cactus may become the dominant plant type in the landscape.