Sponges can be found in almost all water habitats. Although most reside in marine bodies of water, up to 150 different species of sponges have adapted to freshwater climates. Many sponges contain a toxic substance to discourage predators and so other marine animals protect themselves by attatching a sponge to their body where it can grow.
Sponges keep their personal space by releasing the chemicals which avoids competition. Sponges also provide a protective home for many small marine plants, which reside around the sponges pore systems. Some attach themselves to certain corals and molluscs although this is detrimental to the reefs and molluscs. Both degrade and eventually die due to the chemicals and toxins released by the sponge.
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