What are DNA machines, according to Kraves?

they are machines or devices build to find la DNA trace and copy it multiple times.

Explanation:

DNA machines are machines built to find a DNA line and copy it multiple times, so scientists can read, observe, and find information about the DNA strand. For example, DNA machines can determine if someone is related, if someone has cancer, and it can distinguish a person's ancestry. Mainly this is how forensic science uses to determine when there's a suspect in a crime.