Amphibians have a relatively complex circulatory system with a three-chambered heart.
Blood is pumped around the body by a heart .
Amphibians pump blood in a complex manner.
What do amphibians pump around the body in a complex manner?
Options:
[a] SO2
[b] food
[c] Energy.
[d] oxygen
[e] Energy
[f] thoughts
[g] blood
[h] water