Which one of the following insect organ systems has placed the greatest limitation on body size compared to that of vertebrates?
A)nervous system
B)digestive system
C)respiratory system
D)circulatory system
E)excretory system

Question

Quizplus · Accepted Answer

The respiratory system of insects, consisting of a network of small tubes called tracheae, is a highly efficient but limited system. Oxygen diffuses directly into cells from the tracheae, making the system sufficient for small-bodied insects (such as most insects) but unable to support the needs of larger animals. By comparison, the structure and function of the circulatory system in insects is relatively more efficient, allowing greater versatility in size and body shape.

Which One of the Following Insect Organ Systems Has Placed