1. RUBIES • R Read and reread everything. • U Underline the question. • B Bracket the key words • I Identify the key concept or pattern. • E Eliminate the wrong answers. • S Select the best answer.

2. R Read.

3. R Reread everything.

4. U Underline the question.

5. U Underline the question.

6. B Bracket the key words.

7. B Bracket the key words.

8. I Identify the key concept or pattern.

9. I Identify the key concept or pattern. KEY CONCEPTS Ecosystems Energy Flow Food Web Models Limitations

10. I Identify the key concept or pattern. KEY CONCEPTS Ecosystem Energy Flow Food Web Models Limitations PATTERN OF ENERGY FLOW Energy from the Oak tree transfers to the deer and decomposer. The energy in the deer transfers to the mountain lion and leftovers decompose. The mountain lion eventually will also decompose at the end of its life.

11. E Eliminate the wrong answers.

12. E Eliminate the wrong answers. Color will not change the flow of energy.

13. E Eliminate the wrong answers. Each organism needs water, adding it would not change the food web. Color will not change the flow of energy.

14. S Select the best answer. Each organism needs water, adding it would not change the food web. We are focused on this mountain forest ecosystem, not other ecosystems. Color will not change the flow of energy.

15. S Select the best answer. The limitation of this model is that many organisms in this ecosystem are not shown in the model.