Why is it necessary to calibrate the ocular micrometer with each objective?

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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.