Question: You are presented with the question "_ contribute to soils." and the following answer choices: - Sediment - Aphids - cacti - Roundworms - Exfoliation - Amphibians - Ringworms - rainfall Now knowing that roundworms make up the phylum Nematoda and also, nematoda and rotifera are important groups contributing to soils, choose the best answer.
Answer:
Roundworms