Chris took the WAIS in his early 20s and retook it when he turned 40. His overall score was the same both times he took the test. This information can be used to argue that the WAIS is .

Reliable

Explanation:

The consistency of an exam over ta long period of time as regards it's standard, methods or pattern in which it does things which almost produces the same result overtime is seen as a reliable process. Chris retaking the WAIS exam twice and getting same grade shows that the exam or system is a reliable one

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this

the atm that sounds like it should be the answer