Which of these features do(es) not characterize animals without a circulatory system?
A) Single-celled
B) Small and thin
C) Aquatic with a gastrovascular cavity
D) Large body size and very active
E) Relatively large and sedentary

Question

Quizplus · Accepted Answer

Animals without a circulatory system are limited in their size and activity due to their reliance on diffusion for oxygen and nutrient transport. Large body size and high activity levels would require a more efficient method of transport, which is provided by a circulatory system.

Which of These Features Do(es) Not Characterize Animals Without a Circulatory