Contrast passive and active transport through the cell membrane, including energy use and concentration gradients.

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

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