From looking at the pedigree, how do you know if someone is NOT affected by the trait?

answer; ///i believe its: ///(embolus);

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.