An illustrated desert ecosystem scene with saguaro cacti, a hawk in flight, a snake, a mouse, and arrows depicting interactions.

Draw a quick sketch of a desert ecosystem. Include sunlight, water, two cacti, two predators (rattlesnakes, lizards, or hawks), rocks, and one prey (a mouse or small bird) in your sketch. Label each element as biotic or abiotic. Draw a green arrow from each cactus to an abiotic factor they need. This shows competition for that abiotic factor. Draw a red arrow from the predators to a biotic factor they both need. This shows competition for that biotic factor. See more