Which of the following is an agent of erosion?
a. wind
c. acid rain
b. moraines
d. mechanical weathering

Identify the constitutional principle that is common in both this excerpt and federalist no. 51. based on the constitutional principle identified in part (a), explain how the perspective in this excerpt compares with the perspective in federalist no. 51. explain how the constitutional principle identified in part (a) is reflected in the constitution, including two examples to explain how it affects the u.s. political system