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Astute marketers recognize that the increasing disparity of income between upper- and lower-income groups
Secondary Active Transport
involves the movement of substances across a cell membrane utilizing energy indirectly from the electrochemical gradient established by primary active transport.
Concentration Gradient
A difference in the concentration of a substance across a distance, leading to substances moving from an area of high concentration to one of lower concentration.
Carrier Molecule
A protein that facilitates the transport of specific substances across a cell membrane by changing its shape.
Cyanide
A highly toxic chemical compound that can prevent cells from using oxygen, leading to rapid cell death and potentially fatal poisoning.
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