In recent years,the percentage of cases in which the cause of intellectual disabilities is known has dramatically increased due to
A)better assessment practices by teachers.
B)the mapping of the human genetic code.
C)better assessment practices by family physicians.
D)advances in microscopic technology.

Question

Quizplus · Accepted Answer

The mapping of the human genetic code has led to better understanding of the genetic causes of intellectual disabilities, leading to a higher percentage of cases in which the cause is known. Better assessment practices by teachers or family physicians may contribute to identifying disabilities, but they do not directly affect the percentage of known causes. Advances in microscopic technology may aid in diagnosis and treatment, but do not directly contribute to identifying causes.

In Recent Years,the Percentage of Cases in Which the Cause