(par 4.2.3.2.6) Desert (taken from wikipedia)
From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Desert Valle de la Luna (« Valley of the Moon ») in the Atacama Desert of Chile, the world’s driest hot desert[1][2][3][4] Sand dunes in the Rub’ al Khali (“Empty quarter”) of Saudi Arabia A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes […]
(par 4.2.3.2.6) Deserts and Semi-deserts (taken from World Biomes)
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(par 4.2.3.2.4) Grassland Ecosystem Food Chain in Africa
by Lisa Miller, Demand Media http://everydaylife.globalpost.com/grassland-ecosystem-food-chain-africa-38411.html Africa’s grassland, or savanna, ecosystem is an open, grass-covered land with small, interspersed trees. Its diverse species play specific and important roles. Food chains trace the transfer of energy from one organism to another in an ecosystem. They are simple and linear, whereas food webs include all of the […]