Fact 1: Sponges are a source of food for many species of fish. Fact 2: Sea sponges are animals in the Phylum Porifera. Given the two facts above, animals in the Phylum Porifera are a source of what for many species of fish?
Select from the following. 1. oxygen 2. sound 3. food 4. waste 5. life 6. edible 7. Energy 8. amusement
Answer:
3.