pdf Biomes and Ecosystems مجانا للكاتب جون بي رافرتي
Earths biosphere supports several unique biomes and ecosystems. Though they operate as self-contained units, these regions also operate as part of a global network, nurturing interdependence among greatly diverse plant and animal species. The evolution of these wondrous realmsboth aquatic and terrestrialand the various natural elements that distinguish them from one another are the subjects of this comprehensive volume.