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24. Explain how several different niches can exist in the same habitat.

25. Make a model of a food chain using the following organisms: grass, snake, mouse, and hawk.

26. Predict Dandelion seeds can float great distances on the wind with the help of white, featherlike attachments. Predict how a dandelion seed's ability to be carried on the wind helps reduce competition among dandelion plants.

27. Classify the following relationships as parasitism, commensalism, or mutualism: a shark and a remora fish that cleans and eats parasites from the shark's gills; head lice and a human; a spiny sea urchin and a tiny fish that hides from predators by floating among the sea urchin's spines.

28. Compare and contrast the diets of omnivores and herbivores. Give examples of each.

29. List three ways exponential growth in the human population affects people's lives.

erformance Activities

30. Poster Use photographs from old magazines to create a poster that shows at least three different food chains. Illustrate energy pathways from organism to organism and from organisms to the environment. Display your poster for your classmates.

Applying Math

31. Measuring Populations An ecologist wants to know the size of a population of wild daisy plants growing in a meadow that measures 1,000 m2. The ecologist counts 30 daisy plants in a sample area of 100 m2. What is the estimated population of daisies in the entire meadow?

Use the table below to answer question 32.

Lynx and Hare Pelts Sold to the Hudson's Bay Company*

Lynx and Hare Pelts Sold to the Hudson's Bay Company*

Hudson Bay Company Lynx And Hare

* Data from 1875 through 1904 reflects actual pelts counted.

Data from 1905 through 1915 is based on answers to questionnaire.

* Data from 1875 through 1904 reflects actual pelts counted.

Data from 1905 through 1915 is based on answers to questionnaire.

32. Changes in Populations The graph above shows changes over time in the sizes of lynx and rabbit populations in an ecosystem. What does the graph tell you about the relationship between these two species? Explain how they influence each other's population size.

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