When Looking at the Carbon Isotopes Present in the Atmosphere

question 27

Multiple Choice

When looking at the carbon isotopes present in the atmosphere, scientists determined that ¹³C and ¹⁴C levels have decreased over time. What did researchers conclude from these observations?

• A)volcanic activity is responsible for increased atmospheric CO₂
• B)the burning of forests is responsible for increased atmospheric CO₂
• C)the use of fossil fuels is responsible for increased atmospheric CO₂
• D)increased plant/animal respiration is responsible for increased atmospheric CO₂

---

Definitions:

Teleprospecting

The process of using telephone calls to identify and qualify potential leads or sales opportunities, typically as a preliminary step before more in-depth sales activities.

Business Needs

Requirements that must be met for a company to achieve its objectives, often including resources, technologies, and specific strategies.

Observation Method

A research technique where data is collected through direct visual or auditory observation of subjects in their natural environment or settings.

Telemarketer

A person who markets products or services to potential customers over the telephone.