Insufficient dissolved oxygen in the water can cause: death of adults and young reduced growth failed eggs and larvae changes that occur in the species in various water bodies.
The reason why the continental crust differs from the oceanic crust is much different in its compositions. The continental crust is thin and less dense , is made of sedimentary and metamorphic rocks than the oceanic crust and is made of lighter elements. The tectonic plates move the composition to the rocks.
