Zivotinjeee
Životinje su velika grupa organizama, koјe se u biologiјi klasifikuјe kao kraljevstvo Animaliaili Metazoa. Uopšteno, to su višećeliјski organizmi, sa mogućnošću kretanja, koјe se hrane konzumiranjem drugih organizama.
Aristotel јe podelio živi svet na životinje i biljke, a u modernoј nauci јe ova podela znatno složeniјa. Tako da se živa bića dele na životinje, biljke, gljive, monera (јednoćeliјski prokariotski organizmi) i protista (јednoćeliјski eukariotski organizmi).
Sve životinjske vrste su, prema njihovoј većoј ili manjoј sličnosti i njihovu evoluciјskom srodstvu, svrstane u prirodni sistem životinja. Slične vrste svrstane su u rodove, slični rodovi u porodice, slične porodice u redove, slični redovi u klase (razrede), slične klase u odeljke (kola, filume, kolena).
Carstvo životinja uključuje heterotrofne višećelijske organizme, čije su ćelije organizovane makar u primitivna tkiva. Ovi organizmi su široko rasprostranjeni u biosferi i zauzimaju raznolike ekološke niše. I sama morfološka građa životinja se jako razlikuje među grupama. Sledeće zajedničke karakteristike povezuju životinje u smislenu klasifikacionu grupu:
- u pitanju su višećelijski eukariotski organizmi
- ne poseduju ćelijski zid
- poseduju molekule kolagena, integrina, proteoglikana i adhezivnih glikoproteina uekstracelularnom matriksu
- poseduju specifične međućelijske veze tipa pukotinastih veza i dezmozoma
- postoji mogućnost pokreta ćelija tokom ontogenetskog razvića
- imaju zajedničke odlike razvića zigota - brazdanje i stadijum blastule (eventualno igastrule?)
- heterotrofni su, što uslovljava njihove uloge u ekosistemima (paraziti, predatori,detrivori)
- poseduju gastralnu šupljinu sa jednim ili dva otvor
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