The scientific study of life.
The entire portion of Earth inhabited by life; the sum of all the planet's ecosystems.
All the organisms in a given area as well as the abiotic factors with which they interact; a community and its physical environment.
All the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction.
A localized group of individuals that belong to the same biological species (that are capable of interbreeding and producing fertile offspring).
An individual living thing.
A specialized center of body function composed of several different types of tissues.
A group of organs that work together in performing vital body functions.
An integrated group of cells with a common function, structure, or both.
Life's fundamental unit of structure and function.
One of several formed bodies with specialized functions, suspended in the cytoplasm of eukaryotic cells.
Two or more atoms held together by covalent bonds.
Plants and other photosynthetic organisms that convert light energy to chemical energy.
Organisms, such as animals, that feed on producers and other consumers.
Synthesizing complex substances from simpler substances (photosynthesis).
Break down complex into simple substances (digestion).
A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles (bacteria and archaea).
A type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles (protists, plants, fungi, animals).
A type of logic in which generalizations are based on a large number of specific observations.
A type of logic in which specific results are predicted from a general premise.
A tentative answer to a well-framed question.
Use of senses to gather information.
An experiment in which an experimental group is compared to a control group that varies only in the factor being tested.