Biochemical limestones are dominated by carbonate mud and fragments of . Group of answer choices skeletons of marine invertebrates made of calcite and aragonite the phosphatic bones of fish the organic breakdown products of wood and leaves from trees siliceous shells of planktonic diatoms and foraminifera

calcitic and aragonitic skeletons of marine invertebrates

Explanation:

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.