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1.Pszenica --> Mysz ---> Lis ---> Jastrząb
2.plankton----->ukleja----->jazgarz----->okoń----szczupak--->sum---->rybołów------>lis
3.fitoplankton--->wrotki--->oczliki--->larwy ryb--->larwy ważek--->leszcz--->sum