Correct Answer: C. dense

Correct Answer: B. 5

Explanation

The cost price of the whole mangoes = N5x

The sold amount of the mangoes = 3x * 220 = N6.60x

The gain made on mangoes = N6.60x - N5x = N8.00 => N1.60x = N8 => \(x=\frac{8}{1.60}=\frac{1}{0.2}=\frac{10}{2}=5\)

Correct Answer: D. Microphone

Correct Answer: D. as fast

Correct Answer: B. Column B

Correct Answer: A. an independent electoral commission

Correct Answer: C. inbreeding

Correct Answer: A) Stock of goods for resale

Correct Answer: D) mammal

Explanation

The question is asking which group of animals has a characteristic movement of the diaphragm during gaseous exchange. The options are insect, fish, toad, mammal, and plants. The correct answer is D, mammal. Mammals are warm-blooded animals that use lungs to breathe. The diaphragm is a muscle that separates the chest cavity from the abdominal cavity. During inhalation, the diaphragm contracts and moves downward, creating more space in the chest cavity and allowing air to rush into the lungs. During exhalation, the diaphragm relaxes and moves upward, pushing air out of the lungs. This movement of the diaphragm is characteristic of gaseous exchange in mammals, which makes option D the correct answer. Insects, fish, and toads have other methods of gaseous exchange that do not involve the diaphragm. Understanding the movement of the diaphragm during gaseous exchange is important in studying the respiratory system of mammals. It is also important to note that different animals have different respiratory systems and adaptations for survival in their respective environments. To learn more about this, please read the relevant sections of the recommended textbooks.

Explanation

The study of nationalism and nationalist activities is important to the democratic development of a state for several reasons. Firstly, it fosters a sense of unity and common identity among the citizens of a state. This unity is crucial for the smooth functioning of a democratic system as it promotes cooperation and mutual understanding among the diverse groups within the state. Secondly, nationalism encourages active participation in the democratic process. When citizens feel a strong sense of belonging to their nation, they are more likely to take part in elections, voice their opinions, and engage in other democratic activities. Thirdly, nationalism can serve as a bulwark against external threats and influences. A strong sense of national identity can help to protect the democratic institutions of a state from foreign interference. Fourthly, nationalism can promote social cohesion and stability, which are essential for the effective functioning of a democratic system. Lastly, the study of nationalism and nationalist activities can provide valuable insights into the historical, cultural, and social factors that shape the democratic development of a state.