How did cacti adapt in the desert?

During their evolution, cacti have adapted to life in dry and hot places on the planet. To adapt to life in deserts, cactus leaves have turned into small hairs or thorns. This helps the plants retain moisture, as normal leaves need a lot of water and evaporate moisture. The stems have also changed, increased in diameter, and most of the space in them is occupied by conductive tissues, which retain the moisture obtained during the rare rainfall.

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