What do we call a life-form that is so small we need to look at it through a microscope in order to see it?

a time line cause it goes from 685 to 978

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.