Question

• what abiotic factors are important in aquatic environments?
• what is the difference between freshwater and marine ecosystems?

Explanation:

Abiotic factors in aquatic environments include water temperature, dissolved oxygen, salinity, light availability, and water flow. Freshwater ecosystems have low salt - content (less than 0.5 parts per thousand), while marine ecosystems have high salt - content (around 35 parts per thousand). Freshwater ecosystems can be lakes, rivers, and ponds, and marine ecosystems include oceans, seas, and coral reefs.

Answer:

• Abiotic factors important in aquatic environments: water temperature, dissolved oxygen, salinity, light availability, water flow.
• Difference between freshwater and marine ecosystems: Freshwater has low salt - content (less than 0.5 ppt), marine has high salt - content (around 35 ppt). Freshwater includes lakes, rivers, ponds; marine includes oceans, seas, coral reefs.