What two things distinguish the organization of most-celled organisms from the organization of one-celled organisms?

The body of Micro class species like bacteria is formed of a single cell; these organism are described as unicellular. In a unicellular organism, all life activities are carried out by itself with its internal structures.

The intracellular structures are called the organelles. These apecies generally live for a short life span because of all the ondependant effort to survive. An injury can cause death to this organism

In the vast majority of plants and animals, the body is made up of numerous cells. They are called multicellular organisms. A multicellular organism is actually an aggregation of cells.

Here a group of cells functions in a same way to form a tissue or an organ (Example: Xylem vessels, cork cells, cells in the skin).

Multicellular organisms have a great capacity to survive than unicellular organisms. They live for a long span of time and injury or death to some cells does not cause immediate consequences as the cells can easily be replaced

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord. 

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what are the options