2. Climate shifting has caused many populations of organisms to become dispersed and relocate. These organisms now appear in new regions where they have not been seen before. Using an example species, explain what this is called and how it can impact both the species in question and other species in the new area of residence. Is this good or bad for the involved populations? Explain your answer.

A symbiotic relationship where both of the co-existing species benefit from the interaction is called _________. a. commensalism b. parasitism c. mutualism d. communism

Which of the following methods will tell an ecologist about both the size and density of a population? mark and recapture mark and release quadrat life table

The change in the species composition of a terrestrial community from bare and lifeless rock to climax vegetation is called: a. disturbance. b. competition. c. secondary succession. d. primary succession. e. facilitation.

Competition with other species helps determine an organisms (a) ecotone (b) fundamental niche (c) realized niche (d) limiting resource (e) ecosystem

Describe the competitive exclusion principle and its effects on competing species.

With antibiotic resistance rising, researchers are looking for ways to reduce the use of antibiotics. Instead of antibiotic-laced food, some cattle now get probiotic feed with cultured bacteria that can establish or bolster populations of helpful bacteria in the animals gut. The idea is that if a large population of beneficial bacteria is in place, then harmful bacteria cannot become established or thrive. Explain the ecological principle that is guiding this practice.

When an invasive species alters the community structure it is introduced to, what can the consequence be? a. extinction of economically important species b. reduced predation on some native species c. increased predation on some native species d. all of the above

What term describes the use of mathematical equations in the modeling of linear aspects of ecosystems? analytical modeling simulation modeling conceptual modeling individual-based modeling

One reason why human populations have been able to sidestep the factors that usually control population growth is that: a. the carrying capacity for humans has remained constant sincehumans first evolved. b. agriculture and industrialization have increased the carryingcapacity for our species. c. the population growth rate (r) for the human population hasalways been small. d. the age structure of human populations has no impact on itspopulation growth. e. plagues have killed off large numbers of humans at certaintimes in the past.