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a group of organisms of the same species who live in the same area in the same time.

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a complex interacting system of a community of organisms and their abiotic, non-living surroundings, environment.

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Mesocsm must be sealed up with air, soil and water.

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small experimental are that is set up as an ecological experiment to test sustainability of ecosystem and effects of varying conditions.

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while sustainable can continue indefinitely, unsustainable cannot.

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To make ecosystem sustainable:

1. nutrient availability

2. detoxification of waste products

3. energy availability

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all species depend on relationships with other species for long term survival.

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groups of population living and interacting together in an area.

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1. Primary consumer: feed on autotrophs.

2. Secondary consumer: feed on primary consumer.

-take in the undigested material and ingest it to absorb the products of digestion.

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Unicellular organisms that can do both.

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organisms that obtain their carbon compounds from other organisms. (feed off of others). they are divided into groups called consumers, detritivores and saprotrophs.

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organisms that make their own carbon compounds. (self-feeding)

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A supply of organic nutrients is a must for organisms to grow and reproduce.

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note: offspring of cross-breeding are usually infertile.

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Interbreeding: when two members of the same species mate and produce offspring.

Crossbreeding: when two members of different species breed together.

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largest group of organisms capable of interbreeding and producing fertile offspring.