1. Levels of Biological Organization

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

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

4. Community
The living part of an ecosystem.

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

6. Organism
Independent individual.

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

8. Organ
Group of tissues that perform specialized function.

9. Tissue
Group of similar cells.

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

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

12. Molecule
Clusters of atoms.

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

14. Subatomic particles
Fundamental units of energy and matter.

15. All levels can be grouped in 3:
Cellular
Organismal
Populational

19. 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. ( ? )

20. 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.

21. 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.

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