Deep `(gt 500m)` in the oceans 'inhibitants are not aware of existence of celestial source of energy called

Options

A. sun
B. ATP
C. photosynthesis
D. chemosynthesis

Answer

To answer the question regarding the inhabitants of the deep ocean (greater than 500 meters) and their awareness of the celestial source of energy, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Depth**:
- The question specifies organisms that live at depths greater than 500 meters in the ocean. At this depth, sunlight cannot penetrate, creating an environment of complete darkness.

2. **Absence of Sunlight**:
- Since sunlight is the primary source of energy for most life forms on Earth, the absence of sunlight in these deep-sea environments means that organisms living there are not aware of the sun as a source of energy.

3. **Types of Organisms**:
- The organisms found at these depths are primarily heterotrophs, which means they cannot produce their own food. Unlike autotrophs that rely on photosynthesis, these organisms depend on other sources for their nutrients.

4. **Food Sources**:
- Deep-sea organisms often rely on organic matter that falls from the upper layers of the ocean, such as dead organisms or detritus. They may also feed on benthic plankton or other decomposers.

5. **Conclusion**:
- The celestial source of energy that these deep-sea inhabitants are unaware of is the **Sun**. This is because they live in an environment devoid of sunlight, which is essential for photosynthesis and, consequently, for the energy flow in most ecosystems.

### Final Answer:
The celestial source of energy that deep-sea inhabitants (greater than 500 meters) are not aware of is the **Sun**.

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