No. Platypuses are freshwater creatures only.
Platypuses can only live in fresh water.
Yes; platypuses frequently survive into adulthood.
Platypuses are only able to live alongside freshwatersources such as freshwater creeks and rivers. They cannot hunt in salty water.
Platypuses have been known to be taken by freshwater crocodiles in north Queensland. Generally, platypuses and crocodiles do not occupy the same habitat, as platypuses require freshwater and Estuarine crocodiles live in saltwater habitats. Also, crocodiles and platypuses only have their habitat overlap in northern Queensland.
No.
The saltwater crocodile has gills.
Baby platypuses do not have to survive on their own. They suckle from their mother for at least four months, and tend to stay with her until they are around eighteen months to two years old.
yes
Platypuses will quite conceivably survive perfectly well in the future. Although vulnerable to habitat loss and changes brought about by human interference, the platypus has enjoyed a resurgence in its population since becoming a protected animal. There are estimated to be as many platypuses now as there were when European settlement started.
cheese
Certain freshwater fish can survive saltwater conditions; examples are black mollies, mono's and scats. All of these fish aren't truly freshwater or saltwater, they are Brackish. Brackish is between freshwater and saltwater, and so these fish are highly adaptable.
A saltwater crocodile would not survive in fresh water. Salt water animals need the salt to keep them alive and to nourish them.