Name two vertebrates which do not maintain the osmolarity of body fluid.

Explanation

To answer the question regarding the two vertebrates that do not maintain the osmolarity of body fluids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Osmoregulation**:
- Osmoregulation is the process by which organisms regulate the osmotic pressure of their body fluids to maintain homeostasis. This is crucial for the survival of many organisms, especially in varying environmental conditions.

2. **Differentiate Between Osmoregulators and Osmoconformers**:
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