Question

study the timeline.

which statement indicates what the fossil record suggests about evolution on earth?

humans have only recently existed on earth.
organisms originally lived only on land.
life on earth started before water formed on earth.
multicellular life evolved before complex single-celled life.

Explanation:

Analyze the timeline data

The timeline shows major events in Earth's history using Geologic Time Scale markers:

• Earth is formed: \(4.5\text{ BYA}\) (Billion Years Ago)
• Earliest water: \(4.3\text{ BYA}\)
• Single-celled life: \(4.1\text{ BYA}\)
• Earliest oxygen and photosynthesis: \(3.5\text{ BYA}\)
• Complex single-celled life: \(2.5\text{ BYA}\)
• Multicellular life: \(600\text{ MYA}\) (Million Years Ago)
• Land life: \(500\text{ MYA}\)
• Dinosaurs: \(300\text{ MYA}\)
• Mammals: \(200\text{ MYA}\)
• Flowers: \(130\text{ MYA}\)
• Humans: \(5\text{ MYA}\)

Evaluate the options

We evaluate each statement against the Fossil Record timeline:

• Humans have only recently existed on Earth: Humans appeared \(5\text{ MYA}\), which is at the very end of the \(4.5\text{ billion year}\) timeline, representing a very recent existence. This statement is correct.
• Organisms originally lived only on land: The timeline shows single-celled life (\(4.1\text{ BYA}\)) existed long before land life (\(500\text{ MYA}\)). This statement is incorrect.
• Life on Earth started before water formed on Earth: Water formed \(4.3\text{ BYA}\), while single-celled life started \(4.1\text{ BYA}\). This statement is incorrect.
• Multicellular life evolved before complex single-celled life: Complex single-celled life evolved \(2.5\text{ BYA}\), whereas multicellular life evolved much later at \(600\text{ MYA}\). This statement is incorrect.

Answer:

• Humans have only recently existed on Earth. (Correct answer)
• Organisms originally lived only on land.
• Life on Earth started before water formed on Earth.
• Multicellular life evolved before complex single-celled life.