While looking at the basic fingerprint patterns can quickly help eliminate a suspect, in order to positively match a print found at a crime scene to an individual, more is needed. Every individual, including identical twins, has a unique fingerprint due to unique ridge patterns called:

Every individual including identical twins has a unique finger print due to the unique pattern of DNA,Called as DNA finger printing or genetic finger printing.

Explanation:

It is a special technique that is used to detect the unique base pair pattern of DNA.It mainly recognizes the mini satellites in the genome which produce unique pattern in an individual.The first step includes extraction of DNA from a sample and then it is treated with restriction enzyme that cuts the DNA into small fragments.Then addition of gel electrophoresis takes place which separates the DNA according to it's length.After size separation, the DNA is loaded in a well where porous gel is present at one end that acts as a sieve and electrical current is applied to it where negatively charged DNA will run through the gel.The shorter DNA will move fast and then the sample is loaded on the gelThe DNA is then transferred to the fragile gel that produce single strand of DNANylon membrane is then incubated with radioactive probe.These probes tagged the mini stretch of DNA .

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on