Detritivores: These are organisms that feed on dead and decaying organic matter (detritus).

Earthworms: They are classic detritivores, breaking down organic matter in soil and aiding in decomposition.

Millipedes: They feed on decaying leaves and other organic debris on the forest floor.

Woodlice: These small crustaceans are also detritivores, consuming decaying plant and animal matter.

Jellyfish: While they might incidentally ingest some detritus while filtering water for food, they are primarily carnivores, feeding on plankton and small fish.

Seahorses: These are also not detritivores. They are carnivores, feeding on small shrimp, plankton, and other invertebrates.

Therefore, 1,3 and 5 are detritivores.