All life on Earth (the sum of all ecosystems on earth)

Georgetown University

- Atom
- Molecule
- Macromolecule
- Cell
- Tissue
- Organ
- Organ system
- Organism
- Population
- Community
- Ecosystem
- Biosphere / Ecosphere

Traditional Biological Organisation Scheme

An ecosystem describes the interactions between groups of organisms from all biological domains and nonliving things in a shared geographical space.

Solomon, Eldra P.; Berg, Linda R.; Martin, Diana W. (2002), Biology (6th ed.), Brooks/Cole, ISBN 0-534-39175-3, LCCN 2001095366

The smallest piece of a chemical element or ordinary matter

A group of tissues with a similar function

A group of organs that work together to execute one or more functions.

Any living thing that functions as a singular entity

A group of organisms that are (1) the same species (2) in a shared geographical area, and (3) able to interbreed

Groups of populations of different species that interact with each other.

There are many types of macromolecules such as: 

- carbohydrates
- lipids
- proteins
- nucleic acids

The study of energy and matter cycles in an ecosystem.