Respiratory System of Earthworm, Cockroach and Frog

What is the process of respiration in organisms?

How does the earthworm perform respiration?

What happens to the earthworm when its skin dries out?

Explain the role of hemoglobin in respiration.

Describe the respiratory system of a cockroach.

What is cutaneous respiration and which animal uses it?

How do frogs respire when they are on land?