Chapter 2

 Commensalism  Host  Mutualism  Parasites  Parasitism  Symbiosis  Predator  Prey Predator and Prey

1. Describe the pattern shown by the population of hares.2. Describe the pattern shown by the population of lynxes. 2. Explain why changes in the lynx population appear to follow changes in the hare populations. 3. How can a predator species control the population size of its prey? 4. How can a prey species control the population size of its predator? 5. What might happen to the number of lynxes if the plants in the ecosystem became rare? 6. Predict the probable size of each population in Do you think that using the numbers of trapped animals is an accurate method of estimating population size? 8. The northern habitat where these data were collected has relatively few different species. In other ecosystems, such as a forest, the populations of different species do not usually fluctuate so much. Suggest a reason for this

 Carnivore  Consumers  Decomposers  Fermentation  Herbivores  Omnivores  Producers  Scavengers Video

 Read p  Write your own notes on what a food chain is and the roles organisms have in the food chain.  Read p.54 – 55  Write your own notes about Food Webs and Energy Transfer  Read p.55 – 56  Write your own notes about Energy Pyramids

 Read and complete activity 2-3B on page 57 you can answer the questions in your notebook.  When done answer question 7 on page 59.

 Terms ◦ Nutrients ◦ Nutrient Cycles  Read p. 60 – 62  Update your word list

 Nutrients, such as nitrogen and carbon, are recycled in the environment.  All organisms are eventually recycled and their nutrients are returned to the soil by the action of decomposers.

 P.64 questions 1, 3, 5, 8 and 13.