Arrange these biological terms in order of size (from the smallest to the largest): organ, cell, organism, organelle, tissue, system

The smallest item in the list would be organelles.
Organelles are tiny structures within a cell, that help it to function. Example of
organelles are-- nucleus, mitochondria, cell membrane to name a few. Cells are the basic
unit of structure and function of all living things, therefore, cells would have to be
placed second. They are microscopic. A group of similar cells that work together to
perform a specific function, is known as a tissue. Therefore, tissue is next
largest. Examples of  tissues include, muscle tissue, epithelial tissue, adipose tissue.
When different types of tissues work together to perform a function in the body, this
group of tissues forms an organ. An example of an organ is the heart. Inside the heart
are many types of tissue-- cardiac muscle,nerve, blood, connective, etc. The job it
performs is to pump blood.  When various organs work together to perform a specific
function in the body, this makes up a system. An example is the circulatory system. In
this system are many organs that work together. Arteries, veins, capillaries and heart
are all part of the circulatory system. Its job is to circulate blood containing
nutrients and oxygen to cells and to pick up cellular wastes.  All the systems of the
body comprise the organism. An organism is a living thing. It can be as tiny as a
microbe, or a complex as a human. When referring to a multicellular organism, the
correct order from smallest to largest  is-- organelle, cell, tissue, organ, system,
organism.