A(n) is a pattern of dark bands on photographic film that is made when dna fragments are separated by gel electrophoresis and tagged. the photograph produced is often used to determine whether or not suspects were involved in a crime.

DNA fingerprint

Explanation:

DNA fingerprinting is a technique widely used in criminal and forensic investigation. This technique aims to identify fragments of DNA, which like a fingerprint can reveal someone's identity. This is because each individual has a unique, particular and individual ANA, even the restriction zones in the DNAs are different between two different individuals.

This technique is possible because a DNA is subject to the action of restriction enzymes. When biological material is found at a crime scene, the DNA of that material is subjected to restriction enzymes that fragment the molecule into different portions. These portions can be viewed through X-rays, if marked with a radioactive marker. After this marking, the DNA fragments are subjected to agarose gel electrophoresis, revealing a kind of "barcode" that is specific to a single person in the world.

i think the answer is b.

the contamination

we are putting to many trash.