A freshwater organism cannot survive in a water body that has greater _____than its original habitat.

Options

A. oxygen content
B. depth
C. salt concentration
D. water clarity

Explanation

To solve the question, "A freshwater organism cannot survive in a water body that has greater _____ than its original habitat," we need to analyze the options provided and understand the environmental conditions that affect freshwater organisms.

### Step-by-Step Solution:

1. **Understanding Freshwater Organisms**: Freshwater organisms are adapted to live in environments with low salt concentrations. They thrive in water bodies such as rivers, lakes, and ponds, where the salinity is typically less than 5 parts per thousand.

2. **Analyzing the Options**:
- **Oxygen Content**: While oxygen levels are crucial for aquatic life, freshwater organisms can adapt to varying oxygen levels to some extent.
- **Depth**: The depth of water can affect light penetration and habitat availability, but it is not a direct factor that would prevent survival.
- **Salt Concentration**: This is a critical factor for freshwater organisms. They cannot tolerate high salinity levels, which are found in marine environments (30-35 parts per thousand).
- **Water Clarity**: Clarity affects photosynthesis and visibility but does not directly impact the survival of freshwater organisms in terms of osmotic balance.

3. **Identifying the Key Factor**: The most significant factor that would prevent a freshwater organism from surviving in a new water body is the **salt concentration**. If the salt concentration is greater than what they are adapted to, they will face osmotic stress, leading to their inability to survive.

4. **Conclusion**: Therefore, the correct answer to the question is **salt concentration**.

### Final Answer:
A freshwater organism cannot survive in a water body that has greater **salt concentration** than its original habitat.

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