What is the role of water in the evolution of aquatic life?

Explanation

**Step-by-Step Solution:**

1. **Introduction to the Role of Water**: Water is essential for life and plays a crucial role in the evolution of aquatic life. It is believed that life originated in water.

2. **Origin of Life in Water**: The prevailing theory suggests that complex chemical reactions occurred in the water, leading to the formation of the first living organisms. These reactions were influenced by various factors, including minerals present in seawater and sunlight.

3. **Formation of Unicellular Organisms**: Through these chemical reactions, simple unicellular organisms, such as bacteria, were formed. These organisms are considered the building blocks of all life forms.

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