The evolution of multicellular organisms. Prof John Proctor. The impact of the physical environment on organisms. The Earth has a large number of species. Nearly all are very restricted in the areas that they occupy.
All species are always absent from almost everywhere .
Why are sp. Changes in the tropics. Problems with the refugium hypothesis. Features of the Earth s terrestrial biomes. Arctic tundra, chaparral, coniferous forest, deserts, mountains, savanna, temperate deciduous forest, temperate grassland, tropical seasonal forest, and tropical rain forest.