Which of the following animals has the characteristics of mixing of oxygenated and deoxygenated blood in its ventricle?

The correct options are
B Lizard
D Frog
Oxygenated and deoxygenated blood are mixed in the ventricle of a three- chambered heart.

A) Fishes have a two -chambered heart.

B) Frog has a three chambered heart.

C) Lizard has a three chambered heart.

D) Man has a four chambered heart.

So, the answer is 'Frog'.