Levels of Biological Organization

Biosphere Our entire planet Earth and all its living inhabitants. Our entire planet Earth and all its living inhabitants.

Ecosystem Living things in a particular region and their nonliving physical environment. Living things in a particular region and their nonliving physical environment.

Community The living part of an ecosystem.The living part of an ecosystem.

Population Group of individuals of a particular type that live in the same area and actively interbreed with one another.Group of individuals of a particular type that live in the same area and actively interbreed with one another.

Organism Independent individual.Independent individual.

Organ system Body part arranged to carry out a particular general function within the organism.Body part arranged to carry out a particular general function within the organism.

Organ Group of tissues that perform specialized function.Group of tissues that perform specialized function.

Tissue Group of similar cells.Group of similar cells.

Cell The simplest entity that has all the properties of life.The simplest entity that has all the properties of life.

Organelle Structure that performs specialized function for the cell.Structure that performs specialized function for the cell.

Molecule Clusters of atoms.Clusters of atoms.

Atom The smallest unit of matter that still has distinct chemical properties.The smallest unit of matter that still has distinct chemical properties.

Subatomic particles Fundamental units of energy and matter.Fundamental units of energy and matter.

All levels can be grouped in 3: CellularCellular OrganismalOrganismal PopulationalPopulational

Review Clusters of atoms. (molecules)Clusters of atoms. (molecules) Our entire planet earth. ( ? )Our entire planet earth. ( ? ) Independent individual. ( ? )Independent individual. ( ? ) Group of similar cells. ( ? )Group of similar cells. ( ? ) All of the various species living in the same area. ( ? )All of the various species living in the same area. ( ? ) Structure that performs specialized function for the cell. ( ? )Structure that performs specialized function for the cell. ( ? )

Question 1 Which of the following is defined as “the living part of an ecosystem?”Which of the following is defined as “the living part of an ecosystem?” A. biosphere.A. biosphere. B. community.B. community. C. organism.C. organism. D. population.D. population. E. ecosystem.E. ecosystem.

Question 2 Which of the following is defined as “group of individuals of a particular type that live in the same area and actively interbreed with one another?”Which of the following is defined as “group of individuals of a particular type that live in the same area and actively interbreed with one another?” A. ecosystem.A. ecosystem. B. community.B. community. C. population.C. population. D. organism.D. organism.

Answers Question 1: B. community. Question 1: B. community. Question 2: C. population. Question 2: C. population.