Answer: A) 21 Explanation: The given number series follows a pattern that, 19 + 12 = 20 (not 21)20 + 22 = 2424 + 32 = 3333 + 42 = 4949 + 52 = 74    Hence, the odd number in the given number series is 21.

Answer: A) Dragon flies Explanation: Dragon flies have legs but they cannot walk.

Answer: A) TRUE Explanation: Air or gas can build up in the pleural space and when this happens, it's called a pneumothorax. Hence the given statement is TRUE.

Answer: A) a pair of scissors Explanation: Any of the basic mechanical devices for applying a force are called simple machines. There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are related to each other. But, each has a specific purpose in the world of doing work.

The Inter-Services Intelligence (ISI) is the premier intelligence agency of Pakistan, responsible for providing critical national security and intelligence assessments to the government. It was established in 1948 and operates under the jurisdiction of the Pakistan Ministry of Defence. The ISI is primarily focused on safeguarding Pakistan's interests, both domestically and internationally, and plays a crucial role in counterintelligence, counterterrorism, and strategic intelligence.