explain how cells are specialized and what is the relationship between cells and living things?

Cells are the units of structure and function of all living
things, as stated in the cell theory. However, cells are highly specialized to perform various
jobs in a multicellular organism. Types of cells include, muscle cells which are able to contract
and relax leading to movement, bone cells which provide the material to produce the skeleton, a
framework for the body. Epithelial cells are for protection of the organism, fat cells can store
fat for energy use when needed. Neurons or nerve cells are specialized for conducting nerve
impulses to and from the spinal cord and brain. Blood cells are specialized for different
functions--red corpuscles transport oxygen, white corpuscles are part of the immune system and
are for defense against foreign cells. These are just a few examples  of how specialized cells
work together to maintain homeostasis in the body.