Which of these is a fresh water sponge?

Explanation

Spongilla is the only freshwater sponge among the options provided. It is typically found in clean lakes and slow-moving streams. In contrast, Sycon, Leucosolenia, and Euplectella are marine sponges that inhabit different types of saltwater environments. Sycon and Leucosolenia are commonly found in shallower marine waters, whereas Euplectella, known as the glass sponge, is often located in the deep ocean.