yes they do need oxygen that is why the egg's shell have very minute pore for passing the gasses through it.
yes
no because ferns are plants and plants cannot lay eggs because they do not breathe and only things that breathe in or out of water can lay eggs, ferns can only spread around seeds.
Seahorses lay their eggs underwater because they can't breathe on land.
Alligator/Crocodile
That would be feathers, not feather's. Birds have feathers, breath with lungs, and lay eggs.
Possibly something to do with sulphur please see a doctor
reptiles
Birds are similar to reptiles. Both are vertebrates which lay eggs and breathe air.
so when the eggs hatch the baby hermit crabs know where to get the water so they can have it in their shells to breathe.
how does starfish breathe, what ocean does it live in what is its habitat what does it eat does it have any predators does it migrate does it give birth or does i lay eggs where does it reproduce what is its population is the start fish endangered
This description does not fit any known living animals.Reptiles are cold-blooded, breathe with lungs, usually lay eggs and have scaly skin, but they do not have scales. The only creatures with scales are fish, and they do not breathe with lungs.
They are mammals. Fish breathe through gills and lay eggs. Whales don't do either.