by Liz LaRosa

www.middleschoolscience.com

Invertebrate animals that live mostly in saltwater, but there are some species that live in freshwater.

Sponges are non-motile and depend on moving water currents.
Water, food and Oxygen move in : Carbon Dioxide and Wastes move out

Spicules- thin spiny structures that make up the skeleton of sponges.

Reproduction:

Sexual- egg and sperm are released into the water, forming new sponges.
Asexual- budding, a piece breaks off and forms a new sponge which is an exact copy of the parent

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