The Biodiversity Crisis

Art Connections

Figure Scientists measured the relative abundance of fern spores above and below the K-Pg boundary in this rock sample. Which of the following statements most likely represents their findings?

  1. An abundance of fern spores from several species was found below the K-Pg boundary, but none was found above.
  2. An abundance of fern spores from several species was found above the K-Pg boundary, but none was found below.
  3. An abundance of fern spores was found both above and below the K-Pg boundary, but only one species was found below the boundary , and many species were found above the boundary.
  4. Many species of fern spores were found both above and below the boundary, but the total number of spores was greater below the boundary.

Hint:

Figure A. An abundance of fern spores from several species was found below the K-Pg boundary, but none was found above.