In the context of metabolism and homeostasis, homeostasis is a state in which an organism maintains:

• A. A complete absence of feedback regulation in physiological processes
• B. Internal conditions that fluctuate widely to match the external environment
• C. Relatively stable internal conditions despite changes in the external environment
• D. A constant metabolic rate that never changes with activity level or diet

Answer: (C)

Verified step by step guidance

1. Understand the definition of homeostasis: it refers to the ability of an organism to maintain stable internal conditions despite changes in the external environment.
2. Recognize that homeostasis involves feedback regulation mechanisms, such as negative feedback loops, which help keep physiological variables within a narrow range.
3. Eliminate options that contradict this definition, such as 'complete absence of feedback regulation' and 'internal conditions that fluctuate widely,' because these do not align with the concept of stability.
4. Note that homeostasis does not imply a constant metabolic rate regardless of activity or diet; metabolic rate can vary while homeostasis maintains internal balance.
5. Conclude that the correct understanding of homeostasis is maintaining relatively stable internal conditions despite external changes.