Some physical evidence was obtained from a crime scene. for which of these pieces of evidence will forensic scientists conduct an identification test?
a.
a hair strand
b.
a black powder
c.
a glove
d.
bloodstains

The glove is a physical evidence that could be used by forensic scientist to perform an identification test. There are quite a number of elements that could be attached to a glove in a crime scene such as chemicals, organisms, genetic cells etc. There are many techniques such as Spectrometer and Chromatography.  

Explanation:

Some people would answer that a hair strand would be the answer, however; if you found a hair strand you will probably want to run a DNA test to find out if you can find one of the individuals involved in the crime or victims.