Examlex
Some threats to internal validity are related to time and other threats are related to differences between groups.What is a threat related to time?
Concentration Gradient
The gradual difference in the concentration of solutes in a solution between two regions.
Active Transport
The movement of substances across cell membranes against a concentration gradient, requiring energy input typically from ATP.
Diffusion
The process by which molecules move from an area of higher concentration to an area of lower concentration, contributing to the movement of substances within and between cells.
Osmotic Pressure
The pressure that needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
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