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
FIND OUT MORE. The study of life and living things is called biology. Scientists who study biology are known as biologists. The main branches of biology are zoology (the study of animals), botany (the study of plants), and MICROBIOLOGY (the study of tiny organisms).iologists study even more specialized branches within zoology, botany, and microbiology. Cell biology, for example, involves studying one of the smallest units of a living thing. Anatomy, on the other hand, looks at the complete structure of organisms. Physiology is the study of how organisms work.