1. Sea Sponges are animals, not plants.
2. Sea Sponges have been in the ocean for 500 million years.
3. Sea Sponges don’t move, but they filter lots of water for food (plankton) and oxygen.
4. Sea Sponges are among the most simple of multi-cellular organisms.
5. There are about 5,000 species of sea sponges worldwide.
6. Some sponges are found in freshwater lakes and rivers.
7. The smallest sea sponges are 1 inch long (3 cm) (or flat against a rock), the largest over 4 feet tall (1 m).
8. Sponges do not have heads, eyes, brains, arms, legs, ears, muscles, nerves or organs!
9. Sea Sponges have pores that filter water in for food and oxygen, and pores that push out waste.
10. Sea Sponges have few predators other than sea turtles, and fish because some produce toxins.
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