Which Element's Isotope Is Commonly Used to Determine When Biological

question 48

Multiple Choice

Which element's isotope is commonly used to determine when biological samples such as fossils,were formed?

• A)oxygen
• B)hydrogen
• C)carbon
• D)nitrogen
• E)sulfur

---

Definitions:

Famine

A severe shortage of food resulting in widespread hunger, malnutrition, and increased mortality.

Arousal Theory

The theory suggesting that people are motivated to maintain an optimal level of arousal for their best performance.

Homeostasis

The regulatory process by which biological systems maintain stability while adjusting to changing external conditions.

Drive Reduction

A theory suggesting that motivation arises from the desire to reduce physical needs, such as hunger or thirst, thereby maintaining homeostasis.