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
Scientists have developed and changed Mr. Linnaeus classification system as they learn more about living things. For a long time, all life on Earth was divided into five kingdoms. Now many scientists say there are six kingdoms.They have divided the first kingdom into two kingdoms. Make a display of how this classification system works. 2  You may want to get many boxes. 3  The biggest box can be labeled Kingdom.. 4  Label the smaller boxes and put them inside of each other. 5  You may want to use representations of living things inside your boxes.