What are a series of interconnected cavities that are filled with cerebrospinal fluid.?

we need additional information in order to determine the cause of death for anna garcia. there are at least 3 things with explanation included as to why we need them are as follows:

well, i believe that the answer is 2. : 3

what are the options? add them, then i will be glad to .

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.