Answer:
Cactus spines
Explanation:
The cactus spines keep predators away and prevent different organisms from eating it. This helps it to survive in the desert. Another adaptation is very thick, waxy cuticle help to reduce water loss by evaporation.
You may want to let them know about there X-ray but after you should assure them that there is a solution and you'll both get to it
Pretty sure its secondary waves
