In the Section "Investigating Life: Genetic Messages from Ancient Ecosystems

question 20

Multiple Choice

In the section "Investigating Life: Genetic Messages from Ancient Ecosystems," what was the advantage of looking for DNA samples in permafrost?

• A)Most plants and animals evolved in SiberiA.
• B)It is easier to take solid core samples.
• C)The enzymes that make DNA are still active in the cells.
• D)The freezing temperatures preserve the DNA.
• E)Areas with permafrost are older than other parts of the world,allowing scientists to collect samples back 1.5 to 2 million years.