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.
hierarchynoun [ C ] Every organization has a hierarchy, and trying to understand that, and the systems and processes of the organization, is important. corporate/management/organizational/political, etc. hierachy Many kinds of work are more easily and cheaply managed in corporate hierarchies than by individuals doing deals in the market.