Give one example in each case
Change of a bud into a flower is a change which cannot be reversed.

Explanation

### Step-by-Step Solution:

1. **Understanding Irreversible Changes**:
- An irreversible change is a change that cannot be undone or reversed. Once the change has occurred, the original state cannot be restored.

2. **Example of Change of a Bud into a Flower**:
- The transformation of a bud into a flower is an example of an irreversible change. Once a bud blooms into a flower, it cannot revert back to being a bud.

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