Why are astronomers looking for evidence of ancient water on mars?

I am pretty sure they are looking for ancient water on mars, because they are trying to see if mars could be a habitable zone for humans to live

But the truth is, that right now, well... if humans were to live on mars, they would only last on that planet for possibly 40 or 80 seconds unless they have on a suit.

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.