Research and identify a vestigial structure of an organism of your choosing. Why does the organism not need that structure anymore? (Think about what the structure's original purpose was.)

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.