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These secrete digestive enzymes into the dead organic matter and digest it externally. They then absorb the products of digestion. (Many types of bacteria and fungi are saprotrophic).
They are also known as decomposers because they break down carbon compounds in dead organic matter and release elements into the ecosystem, such as nitrogen.

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These ingest dead organic  matter and then digest it internally and absorb the products of digestion. (A type of Heterotroph)

Organic Matter examples: 1. Dead leaves and other parts of plants. 2. Feathers, hairs and other dead parts of animal bodies. 3. Feces from animals.

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Organisms which obtain their carbon compounds from other organisms. (They feed on others.)

Most, if not all, animals are Heterotrophic.

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Organisms which make their own carbon compounds from carbon dioxide and other simple substances. (They are self feeding).

Many Plants are autotrophic.

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A population is a group of organisms of the same species who live in the same area at the same time. (If two populations live in different areas then they are unlikely to interbreed each other. However, this doesn't mean that they are different species. If they could potentially interbreed, then they are still members of the same species.

If two populations of a species never interbreed then they may gradually develop differences in their characters.

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Species are groups of organisms that can potentially interbreed to produce fertile offspring

When two members of the same species mate and produce offspring they are interbreeding.

When two members of different species breed together they are cross-breeding. (the offspring produced by cross-breeding between species are almost always infertile, which prevents the genes of two species becoming mixed.)

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The tissue in our skin needs constant renewal that could not take place without stem cells. Stem cells are what repair damaged tissues in our muscles when we are injured.