Answer:
Humans see optical illusions when the visual system (the eyes and the brain) attempts to interpret an image that evokes a perception that deviates from reality. Your brain displays an image that makes the most “sense,” but it is not always what is actually in front of our eyes.
Answer:
Cactus (Cacti) Joshua Tree (Trees), Desert Lily (Flowers)
Explanation:
The producers I have mentioned are all plants and produce either food or oxygen.