We know it all starts with the cell. And for some species, it ends with the cell. But for others, the cells come together to form tissues, tissues form organs, organs form organ systems, and organ systems combine to form an organism.
The living world can be organized into different levels. For example, many individual organisms can be organized into the following levels:
|
||
There are also levels of organization above the individual organism.
Life on Earth is very diverse. The diversity of living things is called biodiversity. A measure of Earth’s biodiversity is the number of different species of organisms that live on Earth. At least 10 million different species live on Earth today. They are commonly grouped into six different kingdoms. Examples of organisms within each kingdom are shown in the Table below.
Archaea | Bacteria | Protist |
Fungus | Plant | Animal |