Srdce většiny plazů je tvořeno:
Správná odpověď je: D
U plazů se poprvé začíná formovat mezikomorová přepážka. Oddělení pravé a levé komory ale není dokonalé, v mezikomorové přepážce zůstává otvor. Přes tento otvor stále může proudit krev, což vede k míšení okysličené a neokysličené krve. Toto míšení je však podstatně menší než u evolučně původnějšího jednokomorového srdce. Výjimkou jsou krokodýli, kteří již mají mezikomorovou přepážku zcela vytvořenou. K míšení okysličené a neokysličené krve u nich tedy nedochází, neboť mají dvě síně a dvě zcela oddělené komory.
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