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ptaki
ptaki
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guest3702927
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znaczenie ptaków w przyrodzie
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wyrzadzanie szkód w gospodarce,Źrudlo pożywienia i piur, Zapylanie roslin i rozsiewanie nasion, wazny składnik sie i troficznych
ptaki nie zdolne do lotu
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pingwin, struś, kiwi, kazuar
Przystosowanie ptaków do lotu
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zmniejszenie masy ciała przez brak zębów i kości pneumatyczne, wzmocnienie kostnej struktury ciała zwiększenie siły nośne j zmniejszenie oporu powietrza zwiększenie sprawności organizmu
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