TED Ed: Origins of Life on Earth

What were the conditions on early Earth when life began?

• Covered in ice

• Widespread volcanic activity and hostile atmosphere

• Full of forests and rivers

• Calm and stable

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Which elements and compounds are essential for life?

• Hydrogen, methane, nitrogen, carbon dioxide, phosphates, ammonia

• Gold, silver, platinum

• Salt, sugar, water

• Oxygen, helium, neon

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What is the primary difference between autotrophs and heterotrophs?

• Autotrophs generate their own energy, while heterotrophs consume other organisms for energy

• Autotrophs live in water, while heterotrophs live on land

• Autotrophs need oxygen, while heterotrophs do not

• Autotrophs are animals, while heterotrophs are plants

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Why was the Earth's surface not suitable for the first life forms?

• It was too cold

• It was too hot

• The UV radiation was too harsh

• There was no water

What is a hydrothermal vent?

• A type of volcano

• A fissure in the Earth's crust where seawater is heated and ejected

• A deep-sea trench

• A type of underwater mountain

What does LUCA stand for?

• Last Universal Common Ancestor

• Largest Underwater Crust Area

• Lunar Universal Chemical Analysis

• Life's Ultimate Chemical Assembly

What do the shared genes across all species tell us about LUCA?

• LUCA lived in a hot, oxygen-free place and harvested energy from a chemical gradient

• LUCA lived in a cold, oxygen-rich place

• LUCA lived on land

• LUCA was a plant

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What are the two kinds of hydrothermal vents?

• Large vents and small vents

• Deep vents and shallow vents

• Hot vents and cold vents

• Black smokers and white smokers

Why are white smokers considered the top candidates for the cradle of life?

• They have more hospitable temperatures and are rich in methane

• They are found on land

• They release more oxygen

• They are colder than black smokers

What is the name of the field of hydrothermal vents on the Mid-Atlantic Ridge that is a favored candidate for the cradle of life?

• Deep Sea Ridge

• Atlantis

• Lost City

• Found City

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