How can we say that fish exhibits external fertilisation?
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**Step-by-Step Solution:**
1. **Definition of External Fertilization:**
External fertilization is a reproductive process where fertilization occurs outside the female's body. This is different from internal fertilization, where fertilization happens inside the female's body.
2. **Egg Laying by Female Fish:**
In fish, the female lays eggs in the external environment, such as in water. This is a crucial step that indicates external fertilization.
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