Worker bees don't get a chance to reproduce. instead, they take care of their honeybee colony. they are a good example of animals exhibiting:
phoresy
altruism
commensalism
mutualism

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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.