The two-chambered heart of some backboned aquatic animals is part of their:
Options:
- (A) aerobic capacity
- (B) three-chambered heart
- (C) biological diversity
- (D) it keeps an organism warm
- (E) the body's largest organ
- (F) circulatory system
- (G) salmon
- (H) swimming system OK. Let's think hard:
Fish have a circulatory system with a two-chambered heart. Fish are backboned aquatic animals. Some backboned aquatic animals have a circulatory system with a two-chambered heart.
So, the final answer is (F).