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In the figure,two identical ideal massless springs have unstretched lengths of and spring constants of 700 N/m.The springs are attached to a small cube and stretched to a length L of 0.30 m as in Figure A.An external force P pulls the cube a distance
to the right and holds it there.(See Figure B.) The external force P,that holds the cube in place in Figure B,is closest to
Directional
Pertaining to or indicating the direction in which something is moving or facing; also refers to evolutionary changes in a population that favor a specific set of traits.
Stabilizing
A type of natural selection that favors the average individuals in a population, thus maintaining the population’s genetic stability over time.
Disruptive
Pertaining to a type of natural selection that favors extreme values of a trait over intermediate values, potentially leading to speciation.
Disruptive Selection
A type of natural selection that favors extreme values of a trait over intermediate values, leading to two or more contrasting phenotypes in the population.
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