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It is physically impossible for people to grow gills, because God made us this way, to breathe air. He didn't want us to be fish.
If you want the scientific answer it is this:
The main reason is because a mammal would need to have GIGANTIC gills. Gills work for fish because fish are cold blooded. Cold blooded animals need a lot less oxygen than warm blooded animals do. Imagine that you have a 100-pound human and a 100-pound fish sitting on a couch. A human being needs maybe 15 times more oxygen than the fish does. If the human then gets off the couch and starts swimming, the human needs even more oxygen. So does the fish, but fish are super-efficient in the water.
What else can I help you with?
Gills not function well on land?
Gills are specialized organs adapted for extracting oxygen from water, not air. They are not efficient for breathing on land due to their structure and function. Animals with gills typically rely on other respiratory adaptations, such as lungs or skin, to breathe air when out of water.
Do land slugs and snails have gills?
no
How do you program keyless entry remote in 2004 land rover?
My 2004 land rover discovery 2 doesnt work?
How do hermit crabs breath?
As most people know hermit crabs have gills most animals that breathe under water have gills for example a fish. The hermit crabs gill's can work on land but in order for the hermit crab to survive they hermit crabs gills have to be moist....
What helps frogs live in water lungs or gills?
Gills, because lungs help it live on land.
Do Baby frogs have gills?
of coarse tadpoles have gills because through there first weeks of life they live in the water. but they will slowly lose there gills and live on land.
How do fish get oxygen they need?
fishes uses the oxygen resolved in water.
Why do you not have gills?
Land mammals do not have gills because there is no water needed to filter out to get oxygen. Fish have gills because they need to filter out water (and other objects) to get the oxygen to breathe.
Do snakes breathe with lungs or gills?
Only underwater snakes do. Not land snakes.
Why can't fish breathe on land?
The fish hasgills that they use to filter from the water the oxygen they need to as you say "breath" ,so when you put them on land there gills are not working anymore by filtering the water for oxygen because there is no water it's as you know just air (oxygen) so there gills are still trying to work but there is no water to filter oxygen for them.
Do slugs have lungs or gills?
Lungs , no gills. They can drown quite easily.
Do crabs have book lungs?
Absolutely. Everything that breathes air has lungs.
