PCR makes it possible to the tiniest amount of DNA from crime scenes.

PCR makes it possible to sequence the tiniest amount of DNA from crime scenes.

Explanation:

PCR is a process where regions of DNA are amplified to create lots of copies of the DNA. This creates enough material for the lab assistants to be able to analyze the DNA, including sequencing, gel electrophoresis, and other techniques.

This is helpful in crime scenes, where sometimes there are very small amounts of DNA that need to be analyzed.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.