While most plants need regular watering to grow and survive, the cactus plant does not.
This fascinating plant has adapted to living in dry desert regions, where it receives little rainfall.
The cactus is unique in that it has very long roots that stretch out beneath the desert floor to absorb rainfall.
Because the cactus is one of the few plants that can survive in such an arid (see definition and hear pronunciation below) environment, it does not have much competition for the limited nutrients in the desert.
You might say the cactus is even synonymous with the desert.
Cool word vocabulary question of the day: Can you name some of the challenges that humans might face when living in an arid environment?
Arid: Extremely dry; lacking rain or water.
Click here to hear a pronunciation of arid.