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Quil is to porcupine as spine is to cactus
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By evolution
A cactus cat is a bobcat-like creature in North American folklore, said to be covered in spines like a porcupine and to slash cacti at night.
bear skunk cactus porcupine snake
Because it has no true leaves, the only part of a typical cactus that can produce food via photosynthesis is the stem. Through evolution, the leaves have become modified and not form the spines of the cactus, loosing their ability to photosynthesise
Just the same as any other flowering plants. Plants adapt to their environment by evolution some cactus are plants adapted to dry conditions.
leaves high on cactus's tough woody stems= tortoises with flared shell and curve for long neck to reach upleaves low on cactus= tortoises without this adaptation
Some learned behaviors of a cactus include adaptation to environmental conditions such as water scarcity by storing water in their stems, developing thorns for protection against herbivores, and flowering in response to specific triggers like temperature or light patterns.
a cactus
Various species of prickly pear and cholla Claret cup cactus Hedgehog cactus Peyote Rainbow cactus Corncob cactus Living rock cactus Button cactus Eagle claw cactus (aka Turk's head cactus) Fish hook barrel cactus Pincushion cactus Strawberry cactus several others