Which of the Following Scenarios Exemplifies Extinction

question 185

Multiple Choice

Which of the following scenarios exemplifies extinction?

• A) Alexis is a former cocaine user. Now that she no longer uses, her hands no longer shake and her heart no longer pounds when she hears a car pull into her driveway, like her dealer used to do in his car.
• B) Alexis uses cocaine. She no longer feels quite the same rush as she did when she fist started using.
• C) Alexis is a former cocaine user in recovery. After a relapse, though, her hands shake and her heart pounds when she hears a car pull into her drive, like her dealer used to do in his car.
• D) Alexis has relapsed on cocaine. She finds that she doesn't need quite as much of the drug to feel its effects as she did immediately before she stopped using the last time.

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Definitions:

Dinosaurs

A diverse group of reptiles of the clade Dinosauria that first appeared during the Mesozoic Era.

Flowering Plants

Plants that produce flowers as reproductive structures, capable of developing into fruit and seeds.

Biomarker

Molecular evidence of life in the fossil record. Biomarkers can include fragments of DNA, molecules such as amino acids, or isotopic ratios.

Amino Acids

Organic compounds that combine to form proteins, serving as the building blocks of life and playing a central role in biological processes.