Pick from: 1. swamp vegetation 2. roundworms 3. Echinoids 4. tunicates 5. Earthworms 6. some invertebrates 7. most cephalopods 8. Plant and animals
Given those answer options, answer the question: Fact 1: Decomposition increases amount of organic matter in soil. Fact 2: Organic matter is the plant and animal residue in the soil at various stages of decomposition. Given the two facts above, what decomposes in soil?
A:
8.