An ecosystem is all the different organisms living together in a particular environment.
There are two types of ecosystems, artificial and natural. A natural ecosystem is one where humans don't control the processes going on within it. An artificial ecosystem is one where humans deliberately control the growth of certain living organisms and get rid of others which threaten their well-being.
Humans affect (deliberately) artificial ecosystems as there is less biodiversity. Humans can also affect natural ones (not on purpose). Artificial ecosystems can be used for making money - farmers may use pesticides on unwanted insects and feed the animals for slaughtering so more profit is made when it is sold.
Examples of ecosystems - woodlands and lakes are natural whereas greenhouses are artificial.
Many ecosystems are still unexplored around the world. In areas of forests, the ground is so dense that it is difficult to penetrate. Some species are yet to be discovered in the sea and land!
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