Answer:
(b) Crocodiles,
birds, mammals have four-chambered heart.
Heart is usually
three chambered in reptiles with an exception crocodiles, which possess four
chambered heart. The division in their heart is due to the incomplete interventricular
septum, in ventricles.
Heart in
birds and mammals is four chambered and there is a complete division of interventricular
septum in ventricles. Whereas, amphibians possess a three chambered heart in
which the ventrid are not divided hence, 2 atria and one ventricle is present.
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