Scenario Over the Past 60 Years, Many Amphibian Species Have Experienced

question 4

Multiple Choice

Scenario
Over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. Scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. However, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. These global declines suggest widespread problems, including increased ultraviolet radiation, acid rain, and disease. In Switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction.
-Chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. In some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. If these resistant individuals continue to survive and prosper, new resistant populations might emerge. This would be an example of ________.

• A)genetic drift
• B)natural selection
• C)the founder effect
• D)sexual selection

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Definitions:

Existing Firms

Companies or businesses that are currently operating in the market, as opposed to new startups or entities planning to enter the market.

Economic Losses

Economic Losses indicate a situation where the total cost of a business or activity exceeds the total revenue generated, resulting in a net loss.

Long-run Equilibrium

A state in economics where all factors of production and economic agents are fully adjusted to the conditions, and no further tendency for change exists.

Competitive Price-searcher Market

A market structure where firms have some control over their selling price because their products are differentiated.