Короткий опис(реферат):
No organism can live in complete isolation from others, but, existing in one ecological niche, individuals often compete. The competition is due to limited resources such as food, space, water and so on. In some cases, one species may destroy the other for protection purposes rather than for use as a food source. The peculiar manifestations of interspecific interactions are illustrated by predator-prey and host-parasite systems, when one species serves as food for another.