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Hi! Today we are talking about ecosystem. An ecosystem consists of all the organisms living

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in one place plus the physical environment they live in and the interrelationships between them

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too. They may come in all shapes and sizes. They can be as big as an ocean or as small as a fish

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tank. So ecosystems are located in a physical environment which consists of all the non-living

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components in an ecosystem. It includes non-living things, such as water, air or rocks, and factors

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that affect living things, which can be light or temperature. There are two types of physical

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environments. First ones are terrestrial, which are the ones found on land and surrounded by air,

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such as forests or deserts, and the other ones are the aquatic ones, fresh water

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like rivers and salt water like oceans. Next thing are living things, which are

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all the animals, plants, fungi, algae and bacteria in an ecosystem. Every

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ecosystem has its fauna, which are all the animals in one ecosystem, and its

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flora, which are all the plants. They are grouped into species, like rabbits, horses,

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horses, oak trees, only members of the same species can reproduce successfully, all the

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organisms in one species form a population, all the populations in one ecosystem form

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a community, all the communities and living things on the earth make the biosphere.