Autoimmune Disease Genetics. 1  1Division of Rheumatology and Department of Immunology, Mayo Clinic, 200 1st Street SW, Guggenheim Building 3-42, Rochester, MN 55905, USA. 2  2Laboratory of Molecular Medicine and Human Genetics, Department of Medicine, University of Crete, Heraklion, Greece.
Sunlight, soil, water, and pollution, for example, are all important abiotic factors of an environment that affect life. The biotic environment, on the other hand, is composed of all the living organisms in an ecosystem, and includes factors such as disease, predators, prey, and human activity.
A biotic factor would be any living organism - plant, animal, bacteria, etc. An abiotic factor would be non-living things like the sand, rocks, wind, temperature, precipitation, etc. The easiest way to answer this type of question - for any biome - is to picture the terrain in your mind. Then think of an obvious organism that generally characterizes the scene: a leopard or parrot for a rainforest, a cactus or rattle snake for a desert, etc. This is your living, or biotic component. Finally think of all the non-living, or abiotic things that make it unique.