The two basic types of circulatory systems that have evolved over time are
A)flat and circular.
B)open and closed.
C)series and parallel.
D)invertebrate and vertebrate.

Question

Quizplus · Accepted Answer

The two basic types of circulatory systems are open and closed. In an open circulatory system, there is no distinction between blood and interstitial fluid, which gets circulated around the body cavity. In contrast, a closed circulatory system has blood mostly enclosed within vessels and pumped by a heart, supplying substances directly to the tissues.

The Two Basic Types of Circulatory Systems That Have Evolved