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.
Organizational Hierarchy - Biology. 1  Spry Toooltips -Rool the cursor over the terms in level of organization to see sample photos (courtesy of Wikipedia and the author, N. Herr) 2  Form fields (enter data in the cells.)  You may wish to perform this activity using the attached worksheet.