Here's a problem to solve: Which statement best describes a structural adaptation that helps an organism survive in a desert?

Among the 4 following options, which is the correct answer?

- A: A bird builds its nest in a cactus.
 
- B: A rattlesnake shakes its tail when threatened.
 
- C: A lizard crawls under a rock for shelter.
 
- D: The ears of a jackrabbit release heat.
 