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Because they are underwater. They have to get oxygen that is dissolved in the water instead of that available in the air. Fish have an air bladder which controls their buoyancy. Some fish can use it as a lung. When they swim in the water they use their gills. When they are on land, they use their lung.
What else can I help you with?
Fish have this instead of lungs?
Fish Use Gills Instead of lungs. Gills Help fish to Breath. Fish Use Gills Instead of lungs. Gills Help fish to Breath.
How do you use gills in a sentence?
the fish has gills
What does gills help fish do?
Fish use gills to extract oxygen from the water passing over the gills.
What animals use gills?
amphibians use gills AND lungs, fish/marine life use gills alone
What organisms use gills to breathe?
Fish use gills to breathe underwater.
What organisms use gills to breathe oxygen?
A fish! Fish are the only animals with gills and most live in water.
How does a fish use its gills?
to breath
What do clams use for respiration?
Oysters have gills. They absorb oxygen from the water.
What fish can breathe through its gills?
All fish breathe through their gills. Some have additional organs to assist but all fish use their gills to obtain oxygen from the water they live in.
What fish use respiration for?
Fish have internal gills.Gills covered with operculumn except in sharks and rays.They have opened gills
What does gills mean in science term?
Gills are an organ that fish have, that enables them to obtain oxygen from the water that they are in; it is what fish use instead of lungs.
What are skull gills?
holes that fish use to breath
