Levels of Biological Organization

Biosphere Our entire planet Earth and all its living inhabitants.

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

Community • 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.

Organism • Independent individual.

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

Organ • Group of tissues that perform specialized function.

Tissue • Group of similar cells.

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

Organelle • Structure that performs specialized function for the cell.

Molecule • Clusters of atoms.

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

Subatomic particles • Fundamental units of energy and matter.

All levels can be grouped in 3: • Cellular • Organismal • Populational

Review • Clusters of atoms. (

molecules)

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

Question 1 • Which of the following is defined as “the living part of an ecosystem?” • A. biosphere.

• B. community.

• C. organism.

• D. population.

• 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?” • A. ecosystem.

• B. community.

• C. population.

• D. organism.

Answers Question 1: B. community.

Question 2: C. population.