Origins of Life on Earth

What is the estimated age of the oldest fossils found on Earth?

• 2.5 billion years

• 3.5 billion years

• 4.5 billion years

• 5.5 billion years

Which of the following is a potential source of organic molecules on early Earth?

• Volcanic eruptions

• Photosynthesis

• Meteorites

• Ocean currents

Where might organic molecules have formed in the ocean?

• Coral reefs

• Underwater caves

• Hydrothermal vents

• Tidal pools

What structure do some organic molecules spontaneously form that is crucial for early cell development?

• Liposomes

• Proteins

• Polymers

• Crystals

What genetic material is believed to have been present in the earliest cells?

• Proteins

• DNA

• Lipids

• RNA