What kind of adaptation is seen in a large variety of marine invertebrates and fish that live great depths in the ocean?

Options

A. Morphological adaptation
B. Behavioral adaptation
C. Biochemical adaptation
D. More than one option is correct

Answer

To answer the question about the kind of adaptation seen in marine invertebrates and fish that live at great depths in the ocean, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Adaptation**:
- Adaptation refers to the modifications in an organism's structure, behavior, or physiology that enable it to survive in its specific environment.

2. **Identifying the Environment**:
- The question specifies that we are focusing on organisms that live at great depths in the ocean. This environment is characterized by extreme conditions, particularly high pressure due to the weight of the water above.

3. **Recognizing the Challenges**:
- At great depths, the pressure can be immense, which poses a significant challenge for organisms. They must have adaptations that allow them to withstand this crushing pressure without suffering damage.

4. **Types of Adaptations**:
- Adaptations can be morphological (structural), behavioral (actions), or physiological (internal processes). Given the context of high pressure, we need to consider which type is most relevant.

5. **Focusing on Physiological Adaptations**:
- Marine invertebrates and deep-sea fish have developed physiological adaptations. This includes modifications in their body fluids and internal organs that help them maintain structural integrity under high pressure.

6. **Conclusion**:
- Therefore, the adaptation that helps these organisms survive at great depths is primarily a physiological adaptation.

### Final Answer:
The adaptation seen in a large variety of marine invertebrates and fish that live at great depths in the ocean is a physiological adaptation.

---