Earthworms, which are substrate feeders. feed mostly on mineral substrates. filter small organisms from the soil. are bulk feeders that ingest large pieces of food. eat their way through the soil, feeding on partially decayed organic matter.

Verified step by step guidance

1. Identify the feeding habits of earthworms by understanding the different types of feeders mentioned in the options.
2. Recognize that substrate feeders typically consume the material they live in or on.
3. Analyze the option that aligns with the behavior of consuming material from their living environment, which in the case of earthworms is soil.
4. Consider the nature of the material earthworms consume, focusing on whether it is mineral substrates, small organisms, large pieces of food, or partially decayed organic matter.
5. Select the option that correctly describes earthworms as consuming partially decayed organic matter as they move through the soil.