Final answer:
Organisms are structured hierarchically, beginning with atoms that form molecules, which combine to create cells. Cells form tissues, tissues form organs, organs form organ systems, and ultimately these systems combine to form a complete organism.
Step-by-step explanation:
Hierarchical Organization of Organisms
The hierarchical organization of organisms is a structural system that starts at the smallest unit and builds up to create complex, living entities. At the most fundamental level, atoms are the basic units of matter. These atoms join together to form molecules, which are groups of atoms held together by chemical bonds. Molecules are the building blocks of cells, the smallest unit of life. Inside every cell, molecules make up specialized structures called organelles that perform various functions necessary for cell survival and function.
Moving up the hierarchy, similar cells aggregate to form tissues, which are groups of cells carrying out a similar function within the body. These tissues come together to form organs, such as the heart or lungs, each performing specific functions that are vital to an organism's health and survival. Organs are grouped into organ systems, which work together to perform complex functions. For example, the circulatory system moves blood throughout the body, encompassing organs like the heart and blood vessels.
Finally, all these organ systems collaborate to form a complete organism, which is an individual living entity, capable of carrying out all the life processes necessary for survival. From single-celled microorganisms to complex multicellular entities like humans, all life follows this basic hierarchical pattern. This organization allows for specialization of cells and systems, supporting the diverse range of life forms we see on Earth.