Which of these is not a division of hindgut in cockroach?

In which of these structures is collagen fibers present in rows between parallel bundles of fibers?

What does the given figure represent?

What does the question mark represent in the following figure?

Cutaneous respiration in frogs takes place by ___

Frogs have compound eyes. True or false?

How many types of nephridia are present in the earthworm?

Frogs are ___