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The Amazon rainforest, also known as Amazonia, is one of the world's greatest Natural Resources. Because its vegetation continuously recycles carbon dioxide into oxygen, it has been described as the "Lungs of our Planet". About 20% of earth's oxygen is produced by the Amazon rainforest

The world's largest tropical rainforest, Amazonia covers more than half of Brazil. The canopy of Amazonia is less studied than the ocean floor. Scientists believe that the canopy may contain half of the world's species. Over 500 mammals, 175 lizards and over 300 other reptiles species, and one third of the world's birds live in Amazonia. It is estimated that about 30 million insect types can be found here. Competition for survival is fierce. This may explain why over millions of years of evolution so many highly adapted species have evolved in the canopy of Amazonia. The most intense competition is between animals and plants. Both plants and animals have made adaptations to defend themselves from being eaten, and to overcome these defensive systems. Plants trap sunlight and turn it into energy for themselves and the herbivores of the canopy.

Some animals found in the canopy are the harpy eagle, which preys on monkeys, kinkajous, sloth, reptiles, and other birds. Sloths spend most of their lives in the treetops. Their diet of low nutrition leaves forces them to conserve energy, causing the sloth to spend 80% of its life resting. A large portion of a howler monkey's diet consists of leaves, which are hard to digest. Their metabolism is so low that they need to warm themselves up in the sunlight after a chilly night. Leaf-cutter ants are responsible for harvesting a sixth of the area's leaves, bringing leaf fragments to their underground nests. They play a critical role in the rainforest's ecosystem by pruning the vegetation, which stimulates new growth, and breaking down the leaves to renew the soil.

The Amazon rainforest consists of four layers or communities. Each layer has unique ecosystems, plants, and animals adapted to that system. The emergent layer is the tallest layer, where trees can be as tall as 200 feet, and rise well above the canopy. Here they are exposed to fluctuation of temperature, wind, and rainfall. The leaves are small and covered with a thick waxy surface to hold water. They take advantage of the wind by developing winged seeds that are blown to other parts of the forest. Trunks can be up to 16 feet around and braced by massive buttress roots. Some of the animals find everything they need to survive in the emergent layer and never leave it.

The main layer of the rainforest is the canopy. Most canopy trees have smooth, oval leaves that come to a point, known as a drip tip. This allows water to flow off the leaf quickly and prevents the growth of fungi, mosses, and lichens. The canopy's leaves are very dense and filter out about 80% of the sunlight. Many flowers and fruits grow in this layer. Epiphytes cover every available surface and bromeliads provide drinking water for the many canopy creatures, and breeding pools for tree frogs.

The understory only gets about two to five percent of the available sunlight. The plants find unique ways to adapt to this shadowy existence. Their solar-collecting leaves grow large, and are dark green in color. They don't often grow more than 12 feet in height. Because there is very little air movement, they rely on insects and animals to pollinate their flowers. Some grow large flowers and fruits low on their trunks to allow larger, non-climbing animals to eat and disperse their fruit. The largest concentrations of insects inhabit this layer.

The forest floor is the lowest layer and almost no plants grow here. Only about 2% of the sunlight filters through. The floor is littered with decomposing vegetation and organisms that are broken down into usable nutrients. Many nutrients are locked into this biomass. Tree roots stay close to the surface to access these nutrients. Large animals forage for roots and tubers, while insects like millipedes, scorpions, and earthworms use the litter as a source of food.

Despite all of its abundant richness, Amazonia's giant trees grow in the poorest of soil. The top two inches of the acidic soil contains 99% of the nutrients. Nine tenths of the forest's energy is stored in the leaves and tissues of the trees themselves. The forest floor is a porous mass that prevents minerals and nutrients from being washed away and lost. As soon as a tree falls, or a creature dies, decomposers begin to turn it into a food source and mulch. The vegetation to renew the cycle quickly absorbs the nutrients that are released. This is the tightest, most efficient ecosystem in nature. The destruction of one part of the system can spell the destruction of the whole system.

Native peoples of the Amazon rainforest have used different plants for centuries as cures and potions for their health and survival

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12y ago
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13y ago

If it is hot, plants that are well suited to live if that condision will live there, if plants that are well suited for cold weather live there they would die. Or if desert plants were in a wet land they would die, so it all depends on the type of plant and where it lives.

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Q: How do climate and geography affect vegetation?
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