Various monuments constructed in pakistan show their grandeur but nowadays they are being affected by many external factors. Identify some factors to preserve our heritage.

Various external factors such as air pollution, acid rain, development, tourism, and ineffective policies are affecting the monuments.

Explanation:

Sulfur dioxide gases have polluted the air. They fall on the marble stone of the monuments in the form of acid rain. A corrosive reaction takes place, and it dissolves the marble and damages it badly. Other than this, the construction of new buildings around the monuments is also affecting cultural heritage.

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.

the answer is b for brother