Spines help the cactus get moisture. Spines anchor the cactus in the ground. Spines protect the cactus from animals. Spines support the stems and branches of the cactus.
I gave my students this multiple choice question: How do the spines of a cactus help it survive?

Only one answer is correct among these 4 choices:
- Spines help the cactus get moisture.
- Spines anchor the cactus in the ground.
- Spines protect the cactus from animals.
- Spines support the stems and branches of the cactus.

Could you tell me which one is correct?

Spines protect the cactus from animals.