The Encyclopedia Americana, Količina 1Alexander Hopkins McDannald Americana Corporation, 1949 |
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Zadetki 1–3 od 78
Stran 632
... usually happens that the primary axis becomes so bent that the oral and aboral poles approach each other while at the same time one of the secondary axes elongates , becoming the principal axis of the adult , and the body be- comes ...
... usually happens that the primary axis becomes so bent that the oral and aboral poles approach each other while at the same time one of the secondary axes elongates , becoming the principal axis of the adult , and the body be- comes ...
Stran 635
... Usually with alternation of hydroid ( asexual ) and medusoid ( sexual ) generations . Examples , hydroids , small jellyfishes . Order ( 2 ) . Siphonophora : Floating colonies of many polymorphic zooids . Example , Portuguese man - of ...
... Usually with alternation of hydroid ( asexual ) and medusoid ( sexual ) generations . Examples , hydroids , small jellyfishes . Order ( 2 ) . Siphonophora : Floating colonies of many polymorphic zooids . Example , Portuguese man - of ...
Stran 637
... usually attached by a stem . Example stone - lilies . XIII . CHORDATA : Bilateral , segmented animals with an axial skeleton , the notochord , on the dorsal side of which is the tubular nervous system and on the ventral side the ...
... usually attached by a stem . Example stone - lilies . XIII . CHORDATA : Bilateral , segmented animals with an axial skeleton , the notochord , on the dorsal side of which is the tubular nervous system and on the ventral side the ...
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