What do meninges and the cerebrospinal fluids have in common

Both are found in the central nervous system that is, the brain and the spinal cord. Both serve as forms of protection and support to the central nervous system.

Explanation: Meninges is a membranous envelope that offers a protective covering to the brain and the spinal cord against trauma. It is made up of three parts: pia mater, arachnoid and dura mater.

Cerebrospinal fluid is a liquid which flows in the space between the arachnoid mater and the pia mater. It serves as a cushion to the brain and the spinal cord against trauma and provides mechanical and immunological protection to the brain.

b. heterotroph

explanation:

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.