AP BIOLOGY

Detailed explanation-1: -The high species richness or biodiversity found in tropical rain forests is mainly due to their geographic location and the amount of precipitation they receive. Tropical rainforests fall along the equator and receive a large amount of precipitation.

Detailed explanation-2: -The canopy system characteristic of tropical rainforests further increases diversity by creating new niches in the form of new sources of food, new shelters, new hiding places, and new areas for interaction with other species. In fact, it is estimated that 70-90 percent of life in the rainforest is found in the trees.

Detailed explanation-3: -The principal determining climatic factor for the distribution of rainforests in lowland regions of the tropics, therefore, is rainfall, both the total amount and the seasonal variation. Soil, human disturbance, and other factors also can be important controlling influences.

Detailed explanation-4: -High temperatures keep the air warm and wet, with an average humidity of between 77% and 88%. Such humid air produces extreme and frequent rainfall, ranging between 200-1000 centimeters (80-400 inches) per year.