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In the phylum cnideria there are three classes. They are hydrozoa, scyphozoa, and anthozoa. In the class hydrozoa, their habitats are fresh and marine water. In scyphozoa, their habitats are marine only. In anthozoa, their habitats are marine only.
marine fish lay eggs in fresh water river
no
the marine fish would pretty much suffocate and die. so putting marine fish in fresh water is not a good idea.
Fresh water- Rivers Marine water-Oceans Brackish water-Lagoons
Ascarids (round worms) are generally parasitic (so not really marine or fresh water) and worms are either male or female.
Fish are a part of the marine biome. There are two forms of marine biomes: fresh water biomes and salt water biomes.
Platypuses are not marine vertebrates. They can only live near fresh water.
Usually freshwater
Not necessarily. It can be fresh, brackish, or marine.
no they are marine only
Some marine fish can live in fresh water. But most marine fish are adapted to salt water; because of the salt in the water their body needs to do things differently, and they are used to being in salt water. If you put them in fresh water, their body can't do the same thing, therefore most of them die. For more information, see the related question.