IMAGINE..... "If you were one giant cell,.... "
Cells have the ability to specialize to do different jobs for multicellular organisms.
Cells can then divide the work to be done to keep the multicellular organism alive–growing and developing.
IMAGINE a single cell within this multicellular organism dying.
If this happened, there would be other cells remaining to do the job and keep the tissues, organs, systems, and
organism going!
Cells are the basic unit of all living things. All organs are made up of one or more cells.
Cells are produced from other cells. All three of these statements come from the cell theory. The cell theory is a theory that is widely accepted as a truth.
Cells are the structural and functional units of all living organisms. Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, or have many cells. Each cell is an amazing world unto itself: it can take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary. Even more amazing is that each cell stores its own set of instructions for carrying out each of these activities.
All living beings, plants and animals, start their life with a single cell. Indeed, there are diverse forms of life existing as single–celled organisms or unicellular organisms to multicellular organisms; their bodies are composed of different kinds of specialized cells where they are organized as into higher levels of organization, such as tissue systems, organ systems and cells are singled out as the organisms basic unit of life.