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Explanation
John Adams was the second president of the United States. He served as president from 1797 to 1801, following George Washington. Adams was a key figure in the early years of the United States and played a crucial role in the formation of the country's government. He was a strong advocate for independence and played a significant role in drafting the Declaration of Independence. Adams' presidency was marked by challenges such as conflicts with France and the passage of the Alien and Sedition Acts. Despite these challenges, Adams is remembered as a dedicated public servant and a founding father of the United States.

Explanation
Albert Einstein is the correct answer because he is the physicist who formulated the theory of relativity, which includes the famous equation E=mc2. This equation demonstrates the relationship between energy (E), mass (m), and the speed of light (c). Einstein's theory revolutionized our understanding of physics and had a profound impact on scientific research and technological advancements. His work earned him the Nobel Prize in Physics in 1921.

Explanation
The correct answer is "extinct, dead, died out." These three terms are all synonyms and accurately describe the current state of dinosaurs. They no longer exist on Earth and have completely disappeared from the planet.

Explanation
Based on the given options, the correct answer is 10. This implies that the person asking the question is 10 years old.

Explanation
Wilbur Wright and Orville Wright are credited with designing the first working airplane. They were brothers who conducted extensive research and experimentation in aviation. In 1903, they successfully flew their aircraft, the Wright Flyer, for the first time, marking a significant milestone in the history of aviation. Their contributions and innovations in aircraft design and control systems paved the way for the development of modern aviation.