Temperature affects

Options

A. metabolic rate
B. morphology
C. geographical distribution
D. all the above

Answer

To answer the question "Temperature affects," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the effects of temperature on various biological aspects. We have four options to consider: metabolic rates, morphology, geographical distribution, and all of the above.

2. **Analyzing Option 1: Metabolic Rates**:
- Temperature has a significant impact on metabolic rates. Enzymatic activity, which is crucial for metabolic processes, is influenced by temperature.
- As temperature increases, the kinetic energy of molecules also increases, leading to higher enzymatic activity up to a certain point.
- Therefore, temperature does affect metabolic rates.

3. **Analyzing Option 2: Morphology**:
- Morphology refers to the physical appearance and structure of organisms.
- Temperature can influence the development and physical characteristics of organisms. For example, organisms may adapt their morphology to survive in varying temperature conditions.
- Hence, temperature also affects morphology.

4. **Analyzing Option 3: Geographical Distribution**:
- Temperature plays a crucial role in determining the geographical distribution of species.
- Different species are found in specific temperature ranges. For instance, polar regions have organisms adapted to cold temperatures, while tropical deserts host species that thrive in high temperatures.
- Thus, temperature affects geographical distribution as well.

5. **Conclusion**:
- Since temperature affects metabolic rates, morphology, and geographical distribution, we can conclude that all the options are correct.
- Therefore, the correct answer is "all of the above."

### Final Answer:
**Temperature affects metabolic rates, morphology, and geographical distribution. Therefore, the correct option is "all of the above."**

---