[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.doms.cz\/jak-probihal-vyvoj-kytovcu\/#Article","mainEntityOfPage":"https:\/\/www.doms.cz\/jak-probihal-vyvoj-kytovcu\/","headline":"Jak prob\u00edhal v\u00fdvoj kytovc\u016f","name":"Jak prob\u00edhal v\u00fdvoj kytovc\u016f","description":"V\u00a0sou\u010dasnosti v\u00edme, \u017ee prvn\u00ed organismy se vyvinuly v\u00a0mo\u0159i. Teprve pozd\u011bji se dostaly na sou\u0161, kde […]","datePublished":"2022-01-09","dateModified":"2022-01-09","author":{"@type":"Person","@id":"https:\/\/www.doms.cz\/author\/devene\/#Person","name":"devene","url":"https:\/\/www.doms.cz\/author\/devene\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/d6cba3ab97c30e0df0e32548954cb6b1550f4672bd3a4687bf1118b122d757e8?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/d6cba3ab97c30e0df0e32548954cb6b1550f4672bd3a4687bf1118b122d757e8?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"doms.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.doms.cz\/wp-content\/uploads\/velryba3.jpg","url":"https:\/\/www.doms.cz\/wp-content\/uploads\/velryba3.jpg","height":0,"width":0},"url":"https:\/\/www.doms.cz\/jak-probihal-vyvoj-kytovcu\/","about":["V\u011bda"],"wordCount":452,"articleBody":"V\u00a0sou\u010dasnosti v\u00edme, \u017ee prvn\u00ed organismy se vyvinuly v\u00a0mo\u0159i. Teprve pozd\u011bji se dostaly na sou\u0161, kde se vyvinuly do t\u00e9 spousty druh\u016f, kter\u00e9 zn\u00e1me. Ov\u0161em v\u00fdvoj jde n\u011bkdy skute\u010dn\u011b p\u0159ekvapiv\u00fdm sm\u011brem, a snad nikde to neplat\u00ed v\u00edce ne\u017e u kytovc\u016f.\u00a0Mezi kytovce za\u0159azujeme delf\u00edny a velryby. Ti maj\u00ed mimo jin\u00e9 spole\u010dn\u00e9 to, \u017ee se jedn\u00e1 o savce. Ov\u0161em jejich cesta mezi nejv\u011bt\u0161\u00ed \u010di nejinteligentn\u011bj\u0161\u00ed tvory oce\u00e1nu rozhodn\u011b nebyla jednoduch\u00e1. Jak tedy prob\u00edhala?\u00a0V\u011b\u0159te tomu nebo ne, na za\u010d\u00e1tku bylo psu podobn\u00e9 zv\u00ed\u0159e \u017eij\u00edc\u00ed na pob\u0159e\u017e\u00ed. Jako takov\u00e9 se \u010dasto \u017eivilo rybami. Postupn\u011b se na jejich lov za\u010dalo specializovat a z\u00e1rove\u0148 tak\u00e9 tr\u00e1vit st\u00e1le v\u00edce \u010dasu ve vod\u011b. V\u00a0t\u00e9to f\u00e1zi to v\u0161ak st\u00e1le byl suchozemsk\u00fd \u017eivo\u010dich.\u00a0\u00a0B\u011bhem v\u00fdvoje se v\u0161ak za\u010d\u00ednal pou\u0161t\u011bt d\u00e1l a d\u00e1l na mo\u0159e, a jeho t\u011blo se za\u010dalo tomuto \u017eivotn\u00edmu stylu p\u0159izp\u016fsobovat. Ztratil srst, kter\u00e1 p\u0159i plav\u00e1n\u00ed pon\u011bkud p\u0159ek\u00e1\u017eela, a z\u00edskal m\u00edsto toho siln\u011bj\u0161\u00ed tukovou vrstvu, kter\u00e1 jej chr\u00e1nila p\u0159ed chladem.\u00a0Tak\u00e9 jeho kon\u010detiny se postupn\u011b p\u0159em\u011bnily v\u00a0ploutve. Do dne\u0161n\u00edho dne v\u0161ak m\u016f\u017eeme vid\u011bt, \u017ee rozlo\u017een\u00ed kost\u00ed v\u00a0p\u0159edn\u00edch ploutv\u00edch je prakticky toto\u017en\u00e9 s\u00a0rozlo\u017een\u00edm kost\u00ed lidsk\u00e9 pa\u017ee a ruky, a to v\u010detn\u011b prst\u016f. Zde se zm\u011bnila funkce a tvar, z\u00e1klad v\u0161ak z\u016fstal stejn\u00fd.\u00a0\u00a0Co se zadn\u00edch nohou t\u00fd\u010de, ty se st\u00e1valy st\u00e1le men\u0161\u00edmi, a\u017e zakrn\u011bly docela. Na rentgenov\u00fdch sn\u00edmc\u00edch v\u0161ak m\u016f\u017eeme st\u00e1le vid\u011bt jejich kostn\u00ed z\u00e1rodky, a\u010dkoliv nejsou nijak pou\u017e\u00edv\u00e1ny \u2013 podobn\u011b jako kostr\u010d u lid\u00ed.\u00a0Pokud jde o potravu, pak se delf\u00edni a n\u011bkter\u00e9 velryby nep\u0159estaly v\u011bnovat lovu ryb. Jin\u00e9 v\u0161ak vsadily na velikost. Ov\u0161em u\u017eivit tak obrovsk\u00e9 t\u011blo, to chce hodn\u011b potravy. Pot\u0159ebovali tedy naj\u00edt takovou, kter\u00e9 bude dostatek a z\u00e1rove\u0148 bude velmi v\u00fd\u017eivn\u00e1. Odpov\u011bd\u00ed se uk\u00e1zal b\u00fdt plankton a kryl. Z\u00a0tohoto d\u016fvodu se zuby staly kosticemi, kter\u00e9 jej umo\u017e\u0148uj\u00ed z\u00a0vody snadno filtrovat, tak\u017ee se mohou krmit v\u00a0podstat\u011b neust\u00e1le.\u00a0A to je fascinuj\u00edc\u00ed p\u0159\u00edb\u011bh \u017eivo\u010dicha, kter\u00fd se ze sou\u0161e vr\u00e1til zp\u011bt do oce\u00e1nu. Zda se mu to vyplatilo, mus\u00ed posoudit ka\u017ed\u00fd s\u00e1m.                                                                                                                                                                                                                                                                                                                                                                                        3\/5 - (1 vote)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Jak prob\u00edhal v\u00fdvoj kytovc\u016f","item":"https:\/\/www.doms.cz\/jak-probihal-vyvoj-kytovcu\/#breadcrumbitem"}]}]