GPHY 104 Lecture Notes - Lecture 9: Leukemia, Quinine, Curare
24 Dec 2016
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Document Summary
Once covered 14% of earth"s surface now about 6: about 1. 4 billion ha of tropical forests worldwide, 98% of tropical forests are located in developing" countries. Democratic republic of congo 135 million ha. Some tropical forests are thought to have existed for more than 55 million years. Tropical forests produce 40% of earth"s oxygen. They are moist forests usually divided into deciduous and rainforest. Tropical rainforests: 20 c to 35 c, annual rainfall is usually greater than 200 cm, multi-layered canopy little light penetration. Tree adaptations: trees are very straight with tall trunks, most trees have similar smooth, thin bark. This makes it dif cult for plant parasites to grasp on. Makes tree identi cation using bark dif cult: many tropical trees are only able to be identi ed by their owers. Tropical rainforest biodiversity: the american, african, and asian tropical rainforests all have different groups of animals and plant species.
