Question { BBB, 123157 }

What is the difference between schizocoelous and
enterocoelous coelom formation?

Answer

Coelom is a cavity inside mesoderm. Schizocoelic coelom
(schizocoel) develops as a split in the embryonic mesoderm.
Enterocoelic coelom(enterocoel) develops as mesodermal
pouches arising from the gut of the embryo.

Question { 4639 }

Can ocean salt water fishes survive in fresh water ?

Answer

Generally speaking, no. Except a few, some of which are
migratory, marine fishes cannot survive in freshwater. This
is because the marine fishes are adapted to survive in water
with high salt concentration. If they are put in
freshwater, the low concentration of salt in freshwater
(hypotonic) causes entry of excess of water into their body
(endosmosis)which can lead to death of the animal.
Similarly most freshwater fishes cannot survive in salt
water because of exosmosis (loss of water from the body) due
to high salt concentration of sea water.