Choose the INCORRECT statement.
Frogs have four-chambered heart.
The incorrect statement is: Frogs have four-chambered hearts.
Frogs have a three-chambered heart, consisting of two atria and one ventricle. This is different from mammals, birds, and crocodiles which have four-chambered hearts (two atria and two ventricles). The three-chambered heart of a frog allows for some mixing of oxygenated and deoxygenated blood, which is less efficient than the complete separation achieved in a four-chambered heart. Options 2, 3, and 4 accurately describe the heart structures of birds, fish, and crocodiles respectively.
Therefore, the only statement that doesn't accurately reflect the cardiovascular anatomy is the one about frogs having four-chambered hearts.
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