When We Say an Animal Has an "Open Circulatory System

Multiple Choice

When we say an animal has an "open circulatory system," this means that:

A) a small amount of blood may leak out of vessels.
B) blood flows out of vessels and into spaces or sinuses.
C) the animal has a single-chambered heart, so blood mixes from all areas.
D) there are no vessels-blood simply fills all spaces inside the coelom.
E) movement of the animal is solely responsible for moving circulatory fluid.