Choose your answer from:
(1). allow growth.
(2). cleaner for earth.
(3). Plant reproduction.
(4). more abundant.
(5). parasite.
(6). Something that makes plants green.
(7). predator.
(8). deposit feeder for earth.

Fact 1: Earthworms are important deposit feeders that help form and enrich soil. Fact 2: Earth stands for soil, dust or ground. Given the two facts above, an earthworm is an important?
Answer:
(8).