Fish has the greatest population in the ecosystem. In an ecosystem, rocks are required for safe house and plants give oxygen to angle. A biological system is adjusted when the normal creatures and plants and non-living parts are in concordance i.e. there is nothing to aggravate the adjust.
All species are vital and help keep the biological system adjusted. Biological adjust is a term portraying how biological systems are sorted out in a condition of dependability where species exist together with different species and with their condition.