Correct Answer: four

Solution : The correct option is four .

Crocodiles have a four-chambered heart. The heart of a crocodile is similar to that of birds and mammals, exhibiting a complete separation of oxygenated and deoxygenated blood. The four chambers are composed of two atria and two ventricles, allowing for efficient separation of pulmonary (lung) and systemic circulations. This adaptation contributes to the crocodile's ability to be active in aquatic and terrestrial environments.