What is a selectively permeable membrane?

the ablity of the cell membrane to allow something to pass through while preventing other things from passing through

hope it helped:)

The correct answer is:

Both are involved in protecting the brain.

Meninges are membranes that envelop the brain, and cerebrospinal also has to do with the brain, since cerebrum in Latin means brain.

Explanation:

The main function of the meninges and of the cerebrospinal fluid is to preserve the central nervous system. The pia mater is the meningeal covering that substantially adheres to the surface of the brain and spinal cord. Cerebrospinal fluid is a transparent liquid provided within spaces in the brain called ventricles. The meninges are three layers of protecting tissue called the dura mater, arachnoid mater, and pia mater that circle the neuraxis.