Every human being has unique arrangement of skin on his fingers andthis arrangement is unchangeable. Scientists and experts have proved the 1 offinger-prints and discovered that no 2 similar pattern is 3 from parents tochildren, 4 nobody knows why this is the 5 .

　　The ridge 6 on a person’ finger doesn’t change 7 growth and is not affected by 8 injuries. Burns, cuts and other damages to the 9 part of the skin will be replaced 10 by a new one which bears thereproduction of the 11 pattern. It is only when the inner skin is injured thatthe arrangement will be 12 Some criminals make use of this to 13 their ownfinger-prints 14 this is a dangerous and rare step to 15 .

　　Finger-prints can be made very easily with a printer’s ink. Theycan be recorded easily. With special method, 16 can be achieved successfullywithin a short time. 17 the simplicity and economy of this system, finger-printhave often been used as a method of solving criminal cases. A 18 man may denythe charge but this may be 19 . His finger-prints can prove who he is even his 20 has been changed by age or accident.