Why Life on Earth

When did the Earth form?

• A few hundred million years ago

• Approximately 300,000 years ago

• About 4.5 billion years ago

• No later than 3.8 billion years ago

Which of the following is NOT mentioned as a condition necessary for humans to thrive on Earth?

• Sufficient oxygen in the atmosphere

• Presence of plants, fungi, and animals to sustain an ecosystem

• Temperatures that are neither too hot nor too cold

• Abundant sources of fossil fuels

What was the key difference that allowed one group of hominids to survive the food shortage caused by climate change, while others with strong jaws did not?

• They developed stronger teeth to crack the hard nuts.

• They learned to cultivate crops and farm.

• They had larger brains that enabled them to figure out how to crack nuts.

• They migrated to areas with more abundant food sources.

What did the bacteria experiment demonstrate about evolution?

• Organisms always evolve the same genetic code when adapting to new conditions.

• Evolution always proceeds in a single, predictable way.

• Different structures can perform the same function when adapting to changing conditions.

• Bacteria are unable to adapt to significant environmental changes.

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What two fundamental properties must a molecule possess to be considered "alive" at its most basic level?

• The ability to move and communicate.

• The ability to obtain nutrients for energy and reproduce.

• The ability to adapt to its environment and evolve.

• The ability to form complex structures and interact with other molecules.

What natural event is described as the primary way life could transfer from one planet to another?

• Volcanic eruptions propelling organisms into space.

• Solar flares carrying microbial life across the solar system.

• Massive impacts kicking up debris that travels to other worlds.

• Gravitational slingshots launching life forms from planetary surfaces.

What is one of the primary reasons humans are currently unable to naturally transfer to another planet and survive?

• The lack of suitable spacecraft for interstellar travel.

• The absence of sufficiently massive impacts to transport human-containing debris from Earth.

• The inability of humans to adapt to different gravitational forces.

• The scarcity of water on other celestial bodies.

What is the primary reason life appears to be found only on Earth so far?

• Earth possesses unique chemical elements not found elsewhere.

• The process of life arising from non-life is incredibly rare and specific to Earth.

• We have only explored a tiny fraction of the universe for signs of life.

• Other planets are either too hot or too gaseous to support life.