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What three assumptions were the basis of von Thünen's theory? A. Proximity to other cities, variety in land characteristics, various modes of transportation available B. Isolation from other cities, economic stability, homogenous land characteristics C. Isolation from other cities, temperate climate, various modes of transportation D. Proximity to other cities, tropical climate, variety of land characteristics E. Isolation from other cities, homogenous land characteristics, limited methods of transportation

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Which of the following statements is correct? Multiple Choice LIFO results in the same net income as FIFO when costs are rising. O FIFO results in a lower net income than LIFO when costs are rising. LIFO results in a higher net income than FIFO when costs are rising, C LIFO results in a higher net income than FIFO when costs are falling.

<p>1.) How might you add "Keystone species" to the concept map?&nbsp;</p> <p><em>A.) Keystone species</em>&nbsp;increase competition among all&nbsp;populations in a&nbsp;<em>community. &nbsp;</em>&nbsp;</p> <p><em>B.) Keystone species</em>&nbsp;are the most abundant members of&nbsp;<em>communities</em>.</p> <p><em>C.) Keystone species</em>&nbsp;always live with other species in&nbsp;<em>symbiosis</em>.</p> <p><em>D.) Keystone species</em>&nbsp;influence the diversity of&nbsp;<em>communities</em>.&nbsp;</p> <p>2.) What is the correct relationship between the abiotic environment and&nbsp;trophic levels? (Select all that apply.)</p> <p>The resources available in the abiotic environment limit the&nbsp;number of trophic levels in a community.</p> <p>Fat soluble chemicals that organisms at low trophic levels obtain from the abiotic environment will decrease in concentration&nbsp;in the higher trophic levels.</p> <p>Organisms at the lowest trophic level of a community&nbsp;obtain nutrients directly from&nbsp;the abiotic environment.</p> <p>Some of the energy that producers obtain from the abiotic environment is lost at each trophic level.&nbsp;</p> <p>3.) Herbivory has the same effect on species in a community as&nbsp;</p> <p>competition.</p> <p>mutualism.</p> <p>commensalism.</p> <p>parasitism.</p> <p>&nbsp;</p>