How many ommatidia are present in the compound eyes of the cockroach?

What is the function of the part labelled as a question mark in the given diagram?

How many chambers are present in a frog’s heart?

The common prostate and spermatic duct of earthworms is known as ____

Which of the following is not a part of the excretory system of frogs?

The epidermal pits in the middle of each segment of the earthworm contains _____

How can we distinguish the ventral surface of the earthworm by their dorsal surface?

Respiratory exchange in earthworms takes place through __