The involves erroneous recollections of witnessed events that result
from information learned after the fact.

The answer would be sand and gravel

Idont understand i'm sorry

. shsvgd

the correct answer is: " ventricles " .

"recent advances in brain imaging have allowed clinicians to make scientifically useful comparisons in the relative size of the chambers in the brain that are filled with cerebrospinal fluid."

{source: refer to text within question.}.

these chambers are called ventricles .