The role of a watershed is
a) purify water
b) act as a drainage area
c) collect fish from rivers and streams
d) protect wetland areas

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

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.

answer; coat color for blending in with dry grass;