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Ecology
Ecology
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Natural sciences
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Environmental science
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Animal ecology
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Aquatic ecology
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Plant ecology
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Wastes management
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Ecosystems
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Environmental risks
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Felszín alatti vizeink - határok nélkül
mta
György Tóth
Teodóra Szőcs
14 years ago - 20:11
A Föld - adottságaink és lehetőségeink (örökségünk
mta
Tamás Németh
14 years ago - 38:02