What is the respiratory, digestive, and nervous systems in a cactus? If you can, please include a diagram



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    Cacti don’t have respiratory, digestive, and nervous systems as we know them. What cacti do have are stomata, which are openings in the plant’s skin that allow it to breathe air. But since the sun is hot in the desert, cacti only open their stomata at night. They save the air in their bodies until the sun comes out the next day and allows the cactus to use photosynthesis to get its energy from the air it has stored. Cacti also use a network of shallow roots to collect water and store this water in their stems. 

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