What Does the Following Rarefaction Curve NOT Suggest About the Samples

Multiple Choice

What does the following rarefaction curve NOT suggest about the samples?

A) More soil sequences were collected.
B) Indoor air samples appear to be sequenced at enough depth.
C) Water samples were not sequenced at enough depth.
D) More sequencing should be done for these samples.
E) Soil samples were not sequenced at enough depth.