The difference in the concentration of a substance across a space is called a concentration [ equilibrium / gradient ]. ... If there is a concentration gradient, substances will move from an area of high concentration to an area of [ equal / low ] concentration
Answer:
Circulatory System
Explanation:
Capilaries are tubes that transport blood and provide nutrition through diffusion in tissues. Transporting blood is a function of the circulatory system.
The feature that helps organisms survive better in its environment is adaptations.
