Paradoxes tend to resolve themselves, If you were to kill adolf hitler, THAT would cause a huge paradox, But with reason, You could do whatever the hell you wanted in the prehistoric, even hunt game, because, they all reach an enevitable point in the creatacous, There would be some problems but it would eventually fix it self some how. Considering that of course we managed a way that it didnt rip apart reality in theroy...
I dont think it would, rip apart time, That seems way to exagerated like global warming...
But I'd go back through every period (Jurassic Trassic ETC) and observe the magnificent creatures
Life cannot be contained, it breaks walls, crashes through barriers sometimes painfully, but uh... Life uh, finds a way