The basic unit of organization of all organisms is the what?  organ, tissue, organelle, or cell.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

That would be the cell.  The cell is the basic unit of organization for most living things.  Living things can be classified as multicellular, with many cells, or unicellular, having only one cell.  Cells are the basic unit of life in both plant and animal cells.  Cells that all do...

Unlock
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial

That would be the cell.  The cell is the basic unit of organization for most living things.  Living things can be classified as multicellular, with many cells, or unicellular, having only one cell.  Cells are the basic unit of life in both plant and animal cells.  Cells that all do the same thing are banded together to make tissue.  Several tissues banded together to serve a common purpose make up an organ, such as the heart, the stomach, or the lungs.  Several organs that all serve towards the same common purpose are called an organ system.  Examples of organ systems would be the cardiovascular system, that has the heart, arteries, veins, capillaries, and blood, and the respiratory system, that has the lungs.  Different organ systems that serve different purposes for the same effect, generally described as good health, are called an organism, such as a human being.  So, cell is the lowest level, the most common denominator in this hierarchy of cell structure and organization.

Approved by eNotes Editorial Team