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Explanation
The blue whale is the largest animal in the world. It can grow up to 100 feet long and weigh up to 200 tons. It is larger than any other animal, including the giraffe, humpback whale, and elephant. Blue whales are known for their massive size and are found in oceans around the world. They primarily feed on small shrimp-like animals called krill. Due to their size, they have few natural predators and are considered to be an endangered species.

Explanation
Russia is the largest country in the world in terms of area. It spans across both Europe and Asia, covering approximately 17.1 million square kilometers. Russia's vast landmass includes diverse geographical features such as the Siberian tundra, the Ural Mountains, and the vast forests of Siberia. With its large territory, Russia borders multiple countries and has a wide range of climates and landscapes.

Explanation
The femur is the correct answer because it is the largest bone in the human body. It is located in the thigh and is responsible for supporting the body's weight and allowing for movement. The femur is also essential for the attachment of muscles, making it a crucial bone for mobility and strength.

Explanation
Lake Superior is the largest freshwater lake in the world. It is located in North America, on the border between the United States and Canada. With a surface area of approximately 82,100 square kilometers, it holds the title for being the largest freshwater lake by surface area. Its volume is also significant, containing about 12,000 cubic kilometers of water. Lake Superior is known for its stunning beauty and diverse wildlife, making it a popular destination for tourists and outdoor enthusiasts.

Explanation
The correct answer is Sahara. The Sahara is the largest desert in the world, covering an area of approximately 9.2 million square kilometers. It is located in northern Africa and spans across several countries including Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan, and Tunisia. The Sahara is known for its vast stretches of sand dunes, rocky plateaus, and extreme temperatures, making it a harsh and challenging environment to survive in.

Explanation
The Arctic Ocean is the world's smallest ocean. It is located in the northernmost part of the Earth and is surrounded by landmasses such as North America, Europe, and Asia. It is characterized by its cold temperatures, extensive sea ice, and unique ecosystem. The Arctic Ocean is significantly smaller than the other three oceans mentioned (Atlantic, Indian, and Pacific), making it the correct answer to the question.

Explanation
Redwood is the correct answer because it is known to be the tallest tree in the world. Redwoods, specifically the coast redwood (Sequoia sempervirens), can grow to incredible heights, with the tallest recorded specimen reaching over 379 feet (115.7 meters) tall. These trees are native to the coastal regions of California and Oregon in the United States and are well-known for their impressive size and height.

Explanation
1 meter is approximately equal to 3 feet. This is a conversion between the metric system and the imperial system of measurement. The conversion factor is 1 meter = 3.28084 feet, but for simplicity, it is often rounded to 3 feet. Therefore, the correct answer is 3.

Explanation
A rainbow is formed when sunlight is refracted, or bent, by water droplets in the air, creating a spectrum of colors. The spectrum consists of seven distinct colors: red, orange, yellow, green, blue, indigo, and violet. Each color blends into the next, creating a beautiful arc of colors in the sky. Therefore, the correct answer is 7.

Explanation
Pangea was the name of the supercontinent that existed during the late Paleozoic and early Mesozoic era. It was a landmass that included almost all of Earth's continents, and it began to break apart around 200 million years ago. This breakup eventually led to the formation of the continents as we know them today. England, Metropolis, and Pandora are not relevant to the question and do not refer to the supercontinent.