Which property of diffusion best helps explain the necessity of the circulatory system in multicellular organisms?
A) Molecules move from an area of higher concentration to an area of lower concentration.
B) Diffusion can take place in an open system or across a partition that separates two systems.
C) Diffusion is rapid over short distances but much slower over long distances.
D) Diffusion rate is inversely related to molecule size.

Question

Quizplus · Accepted Answer

Diffusion is efficient for moving molecules over short distances but becomes impractically slow for distributing nutrients and removing wastes over the longer distances found in multicellular organisms. This inefficiency necessitates a circulatory system to transport substances efficiently throughout the body.

Which Property of Diffusion Best Helps Explain the Necessity of the Circulatory