Environmental scientists want to conduct DNA surveillance. Which statement best describes how they can use a control sample that is known to
be from a specific species?
A. As a tool to produce multiple banding patterns in the gel
O B. As a positive control to show whether the species is present in the
area
C. As a tool to amplify the strands of all the collected DNA
D. As a negative control to show whether the species is present in
the area