Amphibians and many reptiles have three-chambered hearts, which allows for:
Question
Amphibians and many reptiles have three-chambered hearts, which allows for:
Complete separation of oxygenated and deoxygenated blood
Some mixing of oxygenated and deoxygenated blood
No blood circulation
Two separate hearts
Answer
Some mixing of oxygenated and deoxygenated blood
Detailed Explanation
The three-chambered heart in amphibians and many reptiles tolerates some mixing of oxygenated and deoxygenated blood, unlike the four-chambered hearts of birds and mammals.