gunk

I was watchin dis science documentary wid my frind.it was hosted by a scientist.anyway dey kept a rat in a cage and d scientist kept runnin tests and takes its blood and monitorin evry move dat it made.but den,d test dey ran on d rat helped dem get closer to findin ans.d rat didn't av an choice in d matter.but,y is human lif mor important dan d rats?tel me