Respuesta :
From lower concentration to high concentration motion of particles across a membrane requires energy. thus option B is correct.
What do you mean by concentration?
The concentration of a solution is the ratio of the solute to the solvent or total solution. The most common way to express concentration is in terms of mass per unit volume.
The solute concentration, on the other hand, can be expressed in moles or units of volume.Particles migrate through a cell membrane from a lower concentration to a greater concentration through active transport. The energy-intensive process of pumping molecules and ions across membranes "uphill" - against a concentration gradient - is known as active transport.
Learn more about concentration gradient here:
https://brainly.com/question/13872928
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