Cyanobacteria are thought to have introduced oxygen into the early atmosphere. This was important because oxygen played a key role in . creating an ozone layer to shield life from UV rays the evolution of eukaryotic organisms the greenhouse effect recycling of essential materials the water cycle

answer: c.

explanation:

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.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .