Question

how do scientists use fossils to draw conclusions about the evolution of life on earth?
the fossil record becomes more complete as scientists dig deeper into earth.
ancient dna is preserved in fossils, allowing scientists to compare it to the dna found in modern life.
fossils provide a complete record of all life that has existed on earth.
fossils can be dated, providing a timeline for when certain types of life existed on earth.

Explanation:

• Option A is incorrect: Deeper layers are older, but the fossil record does not become more complete with depth (many organisms don’t fossilize).
• Option B is incorrect: Ancient DNA is rarely preserved in most fossils.
• Option C is incorrect: The fossil record is incomplete (not all species fossilize).
• Option D is correct: Fossils are dated via methods like radiometric dating, creating a timeline of life’s appearance/extinction, which supports evolutionary conclusions.

Answer:

D. Fossils can be dated, providing a timeline for when certain types of life existed on Earth.