What are external costs?
A.
B.
costs that are important in the production of goods but not always considered
costs that form part of a product's price
C.
costs that only consider labor efforts
D. costs that have an impact on the environment
E. costs that consists of raw materials and fixed assets

b brown mice / white sand dunes

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.