A Circulatory System's Sophistication

Multiple Choice

A circulatory system's sophistication

A) is often correlated with a species' need for gas transport.
B) is often correlated with a species' need for food transport.
C) is not correlated with any metabolic functions.
D) varies depending on the current environment conditions an organism lives in.
E) depends on the amount of CO₂ in the lungs.