Sponges also defend themselves by producing chemically active compounds. All cell types within the sponge obtain oxygen from water through diffusion. Their food is trapped when water passes through the ostia and out through the osculum. Sponges lack complex digestive, respiratory, circulatory, reproductive, and nervous systems. This response, much like our own sneezes, allows them to remove unwanted materials from their bodies. The largest group of sponges, demosponges, “sneeze” in response to mechanical stimuli. Sponges lack a nervous system, but somehow are still able to sense external stimuli and organize coherent behaviors. Their pores allow them to filter the water around them for food. Their skeleton types allow them to live in either hard or soft sediments.

Certain sponge species are adapted to freshwater environments. Sponges are strong animals with dense skeletons that are well adapted to their environments. How do sea sponges survive in their environment?

6 What kind of diet does a sea sponge have?.5 How are sea sponges adapted to live in water?.2 How do sea sponges respond to stimuli?.1 How do sea sponges survive in their environment?.

Sponges how do sponges move