Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Many species use their body shape and coloration to avoid being detected by predators. The tropical walking stick is an insect with the coloration and body shape of a twig which makes it very hard to see when stationary against a background of real twigs (Figure 45.20a). In another example, the chameleon can change its color to match its surroundings (Figure 45.20b). Both of these are examples of camouflage, or avoiding detection by blending in with the background. Answer: detection by predators
[EX A]: Many species use their body shape and coloration to avoid what?

[EX Q]: Passage: Frogs and toads are adapted for jumping. Salamanders and newts may walk or swim. Caecilians live in the water or soil and are the only amphibians without legs. Answer: caecilians
[EX A]: What is the only amphibian without legs?

[EX Q]: Passage: Respiration begins with ventilation. This is the process of moving air in and out of the lungs. The lungs are the organs in which gas exchange takes place between blood and air. Answer: lungs
[EX A]:
What is the organ in which gas exchanges take place between blood and air?