14) Which of the following is evidence that groundwater causes erosion and deposition?
A)
the formation of meanders
B)
the formation of stalagmites and stalactites in caverns
the formation of alluvial fans
D)
the formation of large boulders in the desert

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange