does a lobster use gills to breathe

Yes.

Check this site -- near the end.

http://www.veganpeace.com/animal_facts/Lobsters.htm

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Yes, lobsters do use gills to breathe. Gills are specialized organs that are used by many aquatic animals, including lobsters, to extract oxygen from water. The gills of a lobster are located on either side of its body, inside the branchial chamber.

To get a better understanding of how lobsters use gills to breathe, let's break down the process step by step:

1. Water enters through small openings called spiracles, located beneath the lobster's eyes.
2. The water flows over the gills, which are made up of feathery structures called gill filaments.
3. As the water passes over the gill filaments, oxygen dissolved in the water is extracted and absorbed into the lobster's bloodstream.
4. At the same time, carbon dioxide, a waste product, is released from the lobster's bloodstream into the water and carried away.
5. Finally, the water exits the branchial chamber through openings called gill slits and is expelled from the lobster's body.

The exchange of gases (oxygen and carbon dioxide) occurs between the water and the lobster's respiratory system through the thin walls of the gill filaments.

It is worth noting that while lobsters primarily use gills for respiration, they can also absorb a small amount of oxygen directly through their exoskeleton (outer shell). However, the majority of their oxygen supply comes from the gills.