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.
Levels of organization in multicellular organisms include cells, tissues, organs, organ systems, and the organism itself. Different tissues working together to perform a particular function represent another level of organization, the organ.The eye is an organ that functions with the tarsier's brain to allow sight. multicellular organism is a community of cells. Cells in a multicellular organism are specialized. The ways in which the cells work together and interact depend on the organism. You can think of the cells of an organism as members of a community.