Question

why is mammalian called double blood circulation​

Answer 1

The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.

Answer 2

the majority of mammals ( including humans ) utilise a double circulatory system. This means we have two loops in our body in which blood circulates.One is oxygenated meaning of oxygen rich and the other is deoxygenated, which means it has little oxygen but a lot of carbon dioxide.