Answer the following question: Fact 1: Fish have a circulatory system with a two-chambered heart. Fact 2: Fish are backboned aquatic animals. Given the two facts above, the two-chambered heart of some backboned aquatic animals is part of their:?

Select from:
I. aerobic capacity
II. three-chambered heart
III. biological diversity
IV. it keeps an organism warm
V. the body's largest organ
VI. circulatory system
VII. salmon
VIII. swimming system
Answer:
VI.