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Archaea

Domain in which cells are prokaryotic, separate from bacteria.

Bacteria

Domain in which cells are prokaryotic, separate from bacteria.

Biosphere

All the parts of the planet that are inhabited by living things; sum of all Earth's ecosystems.

Cell

Basic unit of living matter; separated from its environment by a plasma membrane.

Class

A group of organisms with common characteristics, attributes, qualities or traits.

Classification

The systematic arrangement of similar entities on the basis of certain differing characteristics and the basis of their relationships.

Consumer

Organism that obtains food by eating producers (autotrophs) or other consumers.

Diversity

The number and variety of species present in an area and their spatial distribution.

DNA

Molecule responsible for inheritance; nucleic acid that contains the sugar deoxyribose.

Domain

Broadest category used to classify life forms.

Ecosystem

Community of living things plus the nonliving features of the environment that support them.

Energy

The capacity for work.

Environment

The external conditions, resources, stimuli etc. with which an organism interacts.

Eukarya

The domain comprised of eukaryotes or organisms whose cells contain a true nucleus.

Eukaryotic

Cell with a nucleus (surrounded by its own membrane) and other internal organelles.

Evolution

Generation-to-generation change in the proportion of different inherited genes in a population that account for all of the changes that have transformed life over an immense time.

Family

Organisms belonging to the same family evolved from the same ancestors and share relatively common characteristics.

Gene

Unit of inherited information in DNA.

Genus

A taxonomic category ranking used in biological classification that is below a family and above a species level, and includes group(s) of species that are structurally similar or phylogenetically related.

Homeostasis

Internal stability or "steady state" maintained by the body.

Kingdom

A taxonomic rank that is composed of smaller groups called phyla (or divisions, in plants).

Multicellular

Consisting of many cells.

Order

A taxonomic rank used in classifying organisms, generally below the class, and comprised of families sharing a set of similar nature or character.

Organisms

Living things.

Photosynthesis

Process by which plants use the sun's energy to convert water and carbon dioxide into sugars.

Phylum

A group of Classes with similar distinctive characteristics.

Population

Group of individuals of the same species living in a particular area at the same time.

Producer

Organism that makes its own food (autotroph) and produces organic molecules that serve as food for other organisms in its ecosystem.

Prokaryotic

Cell lacking a nucleus and most other organelles.

Regulation

The adaption of form or behaviour of an organism to changed conditions.

Reproduction

The production of offspring by organised bodies.

Species

A distinct form of life.

System

Complex organization formed from a simpler combination of parts.

Unicellular

Consisting of a single cell.

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