Populations of a number of species aggregate either because they have the same habitat requirements or because they are developing at the same rate are affected by the same things/

Community Ecology

The effect(s) that two organisms have on each other within a community.

Biological interaction

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

Georgetown University

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

Traditional Biological Organisation Scheme

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

Population (Biology)

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

Biology by Solomon, Berg, and Martin

Molecule 

The smallest piece of a chemical element or ordinary matter

Atom

Cell

Tissue

A group of tissues with a similar function

Organ

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

Organ system

Any living thing that functions as a singular entity

Organism 

Community (Biology)

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

Ecosystem

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

Biosphere / Ecosphere

There are many types of macromolecules such as: 

- carbohydrates
- lipids
- proteins
- nucleic acids

Types of Macromolecules

Population Ecology deals with the dynamics of the species population, how these populations interact with their surroundings, and how they change over time and space.

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