When the walls of the excavations are to be kept vertical and in order to protect the safety of. workmen, the general public, this or other work or structures, or excavation walls, or pipe. installation including ma terials encountered in the excavation which have a tendency to slough.
Hierarchy of Living Things. Biological organization, or the hierarchy of life, is the hierarchy of complex biological structures and system that define life using a reductionistic approach. The traditional hierarchy, as detailed below, extends from atoms (or lower) to biospheres.
Modern classifications of organisms are standardized in a hierarchical system that go from general to specific. Table 9b-1 below describes the detailed classification of the tree red maple. Note that each level of organization is based on some biological characteristic that the organism possesses. Table 9b-1: Hierarchical system of the biological classification of an organism. Category Name Characteristics Kingdom Plantae Organisms that usually have rigid cell walls and usually possess chlorophyll. Subkingdom Embryophyta Plants forming embryos. Phylum Tracheophyta Vascular plants.