How many chambers are present in the heart of a cockroach?

The nuclei of columnar epithelial cells are located at the base.

Frogs have compound eyes. True or false?

Open blood vascular system is present in Pheretima.

In frogs, chyme is passed to the __

The buccal cavity of the earthworm leads to the _____

Which of these is characteristic of hindwings of a cockroach?

During aestivation in frogs, gaseous exchange takes place through __