Name of fresh water sponges and a coelonterata.

Explanation

### Step-by-Step Solution:

1. **Understanding Freshwater Organisms**: Freshwater organisms are those that live in environments with low salinity, such as rivers, lakes, and slow streams. They cannot tolerate high salinity, which can lead to their death due to exo-osmosis.

2. **Identifying Freshwater Sponges**: Freshwater sponges belong to the phylum Porifera. One common example of a freshwater sponge is **Spongilla**.

3. **Identifying Coelenterates**: Coelenterates are organisms that belong to the phylum Cnidaria. A well-known example of a freshwater coelenterate is **Hydra**.

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