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You Are Reading a Study About the Relationship Between Years

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You are reading a study about the relationship between years of heroin use and risk of future overdose. You notice that the researchers randomly selected their sample in a tertiary care emergency room but did not exclude those who were there for treatment for overdose. You are concerned that recruiting at a site that treats patients who have overdosed may overestimate the risk of overdose with this sampling methodology. This could be an example of:


Definitions:

Mountain Biomes

Mountain biomes are ecosystems found in mountainous regions, characterized by distinct climatic conditions at different elevations, leading to diverse flora and fauna adapted to those conditions.

Atmospheric Changes

Alterations in the Earth's atmosphere's composition or properties, often due to natural processes or human activities, that can affect climate and living conditions.

Vegetation Loss

The depletion of plant life in an area due to factors like deforestation, urbanization, or climate change.

Coniferous Forests

Forest ecosystems dominated by cone-bearing trees, such as pines, spruces, and firs, which are mostly evergreen and adapted to cooler climates.

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