Fungi are beneficial to humans as sources of food and as essential support for other types of food.<span> They create important medicines and are even used as biological insecticides. They are also vital decomposers, or saprotrophs, that break down organic waste into more useful forms</span>
Organisms with traits<span> well suited to their environment survive and reproduce more successfully than less well-adapted organisms in the same environment. a. genetic variation in species.</span>
They replace the lost ions by active uptake through active transport
of ions from the surrounding waters. This is exhibited in freshwater fishes that
actively take in these ions through the gills. Most of the ions involved in osmoregulation in freshwater are those of Na+ and Cl-.
