The subarachanoid space lies between the arachnoid and pia mater. It is filled with cerebrospinal fluid. All blood vessels entering the brain, as well as cranial nerves pass through this space. The term arachnoid refers to the spider web like appearance of the blood vessels within the space.
Why do biologists organize living things into groups? What do the levels of classification indicate about the relationship between organisms? What characteristics are used to classify organisms into domains and kingdoms? What is the scientific study of how living things are classified called? Taxonomy
The study of how living things interact with each other and with their environment is called ecology. 1.the branch of biology that deals with the relations of organisms to onâ¦e another and to their physical surroundings.2.the political movement that seeks to protect the environment, especially from pollution.