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The state in which a substance has spread out so there is no net movement is called:
AStatic balance
BPassive transport
CDynamic equilibrium
DOsmotic pressure
Answer & Solution
Correct answer: C. Dynamic equilibrium
1. Diffusion continues until a substance is evenly spread.
2. Individual molecules keep moving even then, so nothing is truly still.
3. This lack of a concentration gradient in which there is no net movement of a substance is known as dynamic equilibrium.
4. Osmotic pressure describes a force, not this end state.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_
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