Ecosystem
All the organisms living in an area together and their physical environment
Biotic factor
Living and once living organisms
Abiotic factor
Nonliving parts of the ecosystem
Organism
An individual living thing
Species
A group of organisms that can mate to produce fertile offspring
Population
All members of the same species that live in the same place at the same time
Community
A group of different species that live in the same place and interact with each other
Habitat
The place an organism lives
Archaebacteria
Microscopic single-celled organisms that do not have a nuclei and are found in harsh environments
Eubacteria
Common microscopic organisms that do not have a nuclei
Fungus
Organisms that absorb their nutrients, for example, mushrooms
Evolution
A change in heredity over time
Protist
Single-celled organisms that can be animal,plant, or fungi-like
Natural selection
Theory of evolution by Darwin, in which individuals that are better adapted to their environment survive to reproduce
Artificial selection
The breeding of organisms by humans for selected traits
Adaptation
A change in a trait that improves the chances of success of a population