The pesticide manufacturers have research that shows that their products do not cause deformities in frogs. Studies by independent researchers show a link between pesticides and frog deformities. How can these two results both be true?

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.