They would most likely hit the carrying capacity (maximum number of organisms a population can support) due to competition and lack of resources.
I believe the correct answer is option C. Weathering produces the sediments that ultimately lead to soil formation. Soil formation is the result of a combination of five factors: parent material, climate, topography, biological factors, and time. Hope this answers the question.
The correct answer is fixed migration pattern.
Extinction means termination of last member of a particular species. This can be due to various factors. The reason could be natural or human interventions. The best characteristics of an organism to be less likely to face extinction are the fixed migration pattern. Migration of that particular species in a fixed pattern will make them adapt different environment. This saves the species from natural extinction. Even if the species of a particular geographical area dies the migrated species will be alive to breed and save the species from extinction.
