Exam (elaborations) Nres219

Nres219 VERIFIED 100% SOLUTIONS 2023//2024 Which of the following statements about change in communities is true? ? ?? Only biotic factors can be agents of change. Only abiotic factors can be agents of change. Disturbances create opportunities for some species to grow and reproduce due to the injury or death of other individuals. "Stress" and "disturbance" are interchangeable words that describe the same process. Humans are the only agents of change for biological communities. - ANSWER Disturbances create opportunities for some species to grow and reproduce due to the injury or death of other individuals. Which of the following human activities can bring about shifts in communities that lead to alternative stable states? habitat destruction introduction of invasive species overexploitation of native species all of the above none of the above - ANSWER all of the above Although beavers are relatively rare, they have considerable influence over species interactions in communities in which they are present, because their dams dramatically alter the environment. The beaver is an example of a(n) __________. ? ?? a. foundation species b. keystone species c. ecosystem engineer? d. Both a and b e. both b and c - ANSWER both b and c What is the primary difference between interaction webs and food webs? Interaction webs include more trophic levels.? Interaction webs include fewer trophic levels. Interaction webs do not consider primary producers, whereas food webs do. Interaction webs include non-trophic interactions, whereas food webs do not. There is no difference between food webs and interaction webs. ? ?? - ANSWER Interaction webs include non-trophic interactions, whereas food webs do not.