... also began appearing in both Mexico and Peru. Which region developed it first is a matter of archeological debate, but its early stages can be most clearly traced in Mexico. Its mountain terrain provided many different growing conditions, ranging from dry to wet and from hot to cool. Consequently, it possessed an enormous variety of edible wild-plant species from which incipient ... ditches farther upstream and leading the water to areas it had not reached before. Under government control, the Peruvians on the coast carried the irrigation systems back up into their mountain sources. The...

• Word Count: 3974
• Approx Pages: 16
• Grade Level: Undergraduate

... forests. The biome is bounded by dry forests and savannas in lowland areas and by subtropical cloud forests (which are continuous with rain forests but commonly support different biota) on mountain slopes. This is the most extensive area of tropical rain forest, much larger than the African or Asian rain-forest regions. VEGETATION. The annual precipitation varies substantially in this zone ... ...

• Word Count: 12375
• Approx Pages: 50
• Has Bibliography
• Grade Level: Undergraduate

... or rivers there by polluting the water and killing thousands of species that live in the water. Habitats with the highest number of threatened mammals and birds are lowland and mountain tropical rainforest. Freshwater habitats are extremely vulnerable with many threatened fish, reptile, amphibian and invertebrate species. In the last 500 years, because of humans 816 species of animals have been ... ...

• Word Count: 2997
• Approx Pages: 12
• Grade Level: High School

... the accepted belief of manifest destiny, and paved new routes to the west for economic purposes. The fur trappers, in search of new beaver reserves, discovered fertile land and paved mountain trails into the deep west. This drew in people of other business to try their hand on homesteads in the discovered regions and expanded the undrawn American borders a bit more ... ...

• Word Count: 2913
• Approx Pages: 12
• Has Bibliography