| Description | Name of Hierarchy Item |
| Portion of the Earth that is capable of sustaining life. | |
| A group of communities living in the same place at the same time; plus all of the biotic and abiotic factors that affect the environment. | |
| A group of different populations living in the same place at the same time. | |
| A group of living organisms of the same species living in the same place at the same time. | |
| A living thing (individual). | |