To release a substance that fulfills some function within the organism.

Numerous disc-shaped portions of an earthworm's body bounded anteriorly and posteriorly by membranes. People identify earthworm species by counting the number of segments anterior to the position of structures such as the clitellum, ovaries, or testes. Segmentation is a characteristic of all annelids.

Basic category of biological classification, characterized by individuals which can breed together.

A small, primitive insect with a turned-under projection on its abdomen which causes it to spring about. Sprintails are often found in worm bins.

To produce conditions which cause an organism to experience discomfort.

Mineral bearing soil located beneath humus-containing topsoil.