Cacti typically grow in very dry climates with infrequent rainfall. When it does rain, the rain usually only penetrates a few inches into the soil. Which adaptation is most likely to help a cactus survive in the dry climate?

Rain usually moistens only the top few inches of soil, so extensive shallow roots can quickly absorb water over a wide area before it evaporates. This adaptation helps the cactus make use of brief, infrequent rainfall. Xylem transports water and minerals, not sugar, and a thin cuticle would increase water loss.

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