For this chain-of-thought reasoning and answer, what was the question?
Roundworms make up the phylum Nematoda. Also, nematoda and rotifera are important groups contributing to soils. Roundworms contribute to soils.
A: (D)
Q: _ contribute to soils.
Options:
- (A) Sediment
- (B) Aphids
- (C) cacti
- (D) Roundworms
- (E) Exfoliation
- (F) Amphibians
- (G) Ringworms
- (H) rainfall