Which pair of the animal groups, has oxygenated and de-oxygenated blood in the heart separately?
A. Amphibians and Reptiles
B. Birds and Mammals
C. Reptiles and Birds
D. Reptiles and Mammals
Answer:B
Which pair of the animal groups, has oxygenated and de-oxygenated blood in the heart separately?
A. Amphibians and Reptiles B. Birds and Mammals C. Reptiles and Birds D. Reptiles and Mammals