Match the following and choose the correct option

a) Earthworms	i) Tracheal tubes
b) Sponges	ii) Simple diffusion
c) Insects	iii) Gills
d) Fishes	iv) Moist cuticle

	a	b	c	d
1	ii	iv	iii	i
2	ii	iv	i	iii
3	iv	ii	i	iii
4	iv	ii	iii	i

In the context of respiration, different organisms have evolved various mechanisms to facilitate gas exchange. Earthworms rely on their moist cuticle, which allows for the exchange of gases through simple diffusion. 

Sponges, being simple aquatic animals, also use simple diffusion to exchange gases with their surrounding environment.

Insects, on the other hand, have developed a specialized respiratory system called tracheal tubes. These tubes are a network of tiny air-filled tubes that extend throughout the insect's body, allowing direct delivery of oxygen to individual cells.

For fishes, respiration occurs through gills. Gills are feathery structures located in the fish's gill chambers that extract oxygen from the water as it passes through, and release carbon dioxide into the water.