1. Bellringer 7-10 minutes: Review Characteristics of Life. Quietly quiz each other.

2. Predator-Prey In a predator-prey relationship one organism benefits and the other is killed.

3. Predator-Prey Cycle Prey Population = Predator Population More predators = more prey eaten Prey Population Goes = Predator Population Goes Less predators = less prey they eat Predator: hunts: wolf Prey: hunted: rabbit

4. Lab Report 1. Title for your Experiment 2. Hypothesis: Write your hypothesis (If, then) format 3. Materials: List materials: Include amounts 4. Procedure: List steps 5. Data Table: Label with Dates, Day number observed, Quantitative Data, Qualitative Data

5. Nutrition and Energy Flow Goal 5

6. 1. What is the source of all of the energy in this ecosystem? 2. What path (through what organisms) does the energy take to get to the hawk? Focus Question

7. How Organisms Obtain Energy Autotrophs= Plants= Producers: make their own food through photosynthesis. Use energy from the sun through the process of photosynthesis to make sugar

8. Heterotrophs=consumers Animals, Fungus, Bacteria, Protist Consume others to obtain energy Carnivores= eat meat Herbivores= eat plants Omnivores= eat plants and meat Decomposers= break down dead/decaying organisms

9. Source of All Energy The sun is the source of all energy. The energy flows from the sun, to producers, to consumers.

10. Food Chain –Single path as animals eat each other –Autotroph to heterotroph to decomposers Food Web –MANY interconnected food chains –More realistic

11. Food Chain vs. Food Web Real life not as simple as a food chain

12. Trophic Levels Producers are at the bottom Herbivores: 1 st level consumers Carnivores and Omnivores: 2 nd and above consumers Decomposers: All levels

13. Energy Pyramid Only 10% of the energy from each level is transferred to the next level. Energy is lost for movement and life processes

14. Biomass Pyramid Biomass is greatest in producers. The mass is highest in producers Pyramid of Biomass Shows mass that is required to support level above

15. Number Pyramid The number of individual organisms is highest in producers and steadily decreases

16. Summary of Trophic Levels and Energy Flow: What does the picture tell us?