They show that there was an ocean over the plains long ago, and fossils are always used to elaborate on the history of life/how it developed.
        
             
        
        
        
First of, what you are referring to zeroth power is not that, actually. It is the symbol for degrees.
If the angles are complementary it means they add up to 90 degrees.
Therefore  (2x+2) + (3x-5) = 90
                2x + 3x +2 -5 = 90
                           5x - 3 = 90
                                   5x = 90+3.
                                    5x = 93.    Divide both sides by 5.
                                       x = 93/5 = 18.6 
Therefore:  (2x+2) = (2*18.6+2) = 37.2 + 2 = 39.2  degrees.
                (3x- 5) = (3*18.6-3) = 55.8 - 3 =  52.8  degrees.
So the measure of the smaller anger is 39.2 degrees.
Cheers.
        
             
        
        
        
History was a driving force behind such migration, since humans tended to move to new territory when they lacked food, shelter, or other resources--meaning that most of the conflicts throughout history have been driven by the same forces that drove migration out of Africa. 
        
             
        
        
        
It creates a Shield Volcano.
I hope this helps! =)