Origin of Life

Why was Lord Kelvin's estimation of Earth's age inaccurate?

• He didn't account for the Earth's internal radioactive heating.

• He didn't consider the effect of convection currents within the Earth.

• He assumed the Earth started as a molten rock.

• Both A and B.

How was the current accepted age of the Earth primarily determined?

• By analyzing the cooling rate of molten rock.

• By studying the fossil record in sedimentary rocks.

• By dating meteorites using lead-lead dating.

• By observing the rate of continental drift.

What significant event occurred approximately 3.5 billion years ago, leading to a major change in Earth's atmosphere?

• The first appearance of multicellular life.

• The beginning of photosynthesis.

• The Cambrian explosion.

• The formation of the Moon.

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What significant organic molecules were produced in the Miller-Urey experiment?

• Carbohydrates

• Lipids

• Amino acids

• Nucleic acids

Which of the following is a fundamental characteristic shared by all known life forms on Earth?

• The ability to perform photosynthesis.

• A multicellular body plan.

• The use of DNA as genetic material.

• The presence of a cell wall.

As humans, what have we stepped outside of evolution to add?

• culture

• history

• fame

• big bang