The term refers to the number of components and the relationship among components.

a. complexity
b. frequency
c. pitch
d. intensity

The term complexity refers to the number of components and the relationship among components.

Option: A

Explanation:

Complexity describes the behaviour of a process or model whose elements communicate in various ways and follow local laws, implying that there is no logical, higher guidance to describe the various connections available.

The word is usually implemented to describe anything with several parts where those parts participate in multiple ways, resulting in a higher dimension of appearance greater than the sum of its parts.

Complexity has become a feature of our world and several scientific fields have therefore struggled with complicated systems and anomalies.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.