" raymond cattell determined that there were 16 basic traits that could describe differences in personality. he called these traits."

‘‘He called these source traits’’

Explanation:

Raymond B. Catell (1905-1998) was an American psychologist of British origin, who researched on the basic dimensions of personality and temperament. He was a pioneer in the use of factor analytic methods in order to explore the basic dimensions of personality.

One of his main contributions was the discovery of sixteen separate trait factors, what he called ‘‘source traits’’, within the personality sphere.

Also, he conducted important research in other areas of psychology as intelligence and career assessment.

Ah but you see where did the virus come from? The Zombie Virus idea came from when some person drank milk that expired 200 years before he was born, on which he became so severely poisoned that he became what people can call a zombie... though I am pretty sure this is an urban tale... UωU