Across
- 3. all living organisms in a given area plus the physical environment and energy.
- 7. the sum total of all ecosystem on earth
- 8. it is the study of the natural world
- 9. it is the first step in the scientific method
- 12. all the population of different species that coexist and interact within the same environment
- 13. an individual living being composed of several organs or organ system.
Down
- 1. smallest/most specific unit of classification
- 2. a group of similar associated cells specialized to perform a specific function.
- 4. two or more atoms held together in a stable association with each other.
- 5. second smallest/most specific unit of classification
- 6. fundamental structural and functional
- 7. able to stand and walk on two legs
- 9. a structure composed to two tissues or more different tissues working together to perform a specific function.
- 10. a domain that has 4 kingdoms
- 11. smallest unit of an element; composed of protons, neutrons and electrons