### Identifying the Essential Gas

1. **Understanding the Role of Gases in Marine Ecosystems**
- In marine ecosystems, gases dissolved in water play crucial roles in supporting aquatic life. Oxygen is vital for respiration, while other gases can be important for various biogeochemical processes.

2. **Evaluating the Options**
- a. **Carbon Dioxide**: This gas is crucial for photosynthesis, particularly by marine plants and phytoplankton, contributing to the oxygen produced in the ecosystem.
- b. **Calcium**: This is a mineral rather than a gas and is important for marine organisms like corals but does not fit the criteria of being an essential gas.
- c. **Sodium**: This element is primarily found in seawater and is important for balancing ions in marine environments but isn't categorized as a gas.
- d. **Helium**: This noble gas is present in trace amounts in the atmosphere and water but is not essential for marine life.

### Conclusion
The most relevant and essential gas for a marine ecosystem alongside oxygen is **carbon dioxide** because of its significant role in photosynthesis and overall carbon cycling.

### Final Answer
**Carbon dioxide (a)** is the second most essential gas in marine ecosystems.

Question

### Identifying the Essential Gas

1. **Understanding the Role of Gases in Marine Ecosystems**
   - In marine ecosystems, gases dissolved in water play crucial roles in supporting aquatic life. Oxygen is vital for respiration, while other gases can be important for various biogeochemical processes.

2. **Evaluating the Options**
   - a. **Carbon Dioxide**: This gas is crucial for photosynthesis, particularly by marine plants and phytoplankton, contributing to the oxygen produced in the ecosystem.
   - b. **Calcium**: This is a mineral rather than a gas and is important for marine organisms like corals but does not fit the criteria of being an essential gas.
   - c. **Sodium**: This element is primarily found in seawater and is important for balancing ions in marine environments but isn't categorized as a gas.
   - d. **Helium**: This noble gas is present in trace amounts in the atmosphere and water but is not essential for marine life.

### Conclusion
The most relevant and essential gas for a marine ecosystem alongside oxygen is **carbon dioxide** because of its significant role in photosynthesis and overall carbon cycling.

### Final Answer
**Carbon dioxide (a)** is the second most essential gas in marine ecosystems.

Knowee AI · Accepted Answer

### Identifying the Essential Gas

1. **Understanding the Role of Gases in Marine Ecosystems**
   - In marine ecosystems, gases dissolved in water play crucial roles in supporting aquatic life. Oxygen is vital for respiration, while other gases can be important for various biogeochemical processes.

2. **Evaluating the Options**
   - a. **Carbon Dioxide**: This gas is crucial for photosynthesis, particularly by marine plants and phytoplankton, contributing to the oxygen produced in the ecosystem.
   - b. **Calcium**: This is a mineral rather than a gas and is important for marine organisms like corals but does not fit the criteria of being an essential gas.
   - c. **Sodium**: This element is primarily found in seawater and is important for balancing ions in marine environments but isn't categorized as a gas.
   - d. **Helium**: This noble gas is present in trace amounts in the atmosphere and water but is not essential for marine life.

### Conclusion
The most relevant and essential gas for a marine ecosystem alongside oxygen is **carbon dioxide** because of its significant role in photosynthesis and overall carbon cycling.

### Final Answer
**Carbon dioxide (a)** is the second most essential gas in marine ecosystems.

Two most essential gas in marine ecosystem are oxygen and…….Question 8Answera.Carbon dioxideb.Calciumc.Sodiumd.Helium

Question

Two most essential gases in marine ecosystems are oxygen and….

Solution

Identifying the Essential Gas

Conclusion

Final Answer

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