Biotic factors are living things that an organism needs to survive and carry out it's life as it should. Biotic factors in the desert include food and symbiotic relationships. Every organism consumes either a plant or an animal of a specific form. Every organism depends on food to sustain its bodily functions. Symbiotic relationships are interactions that effect an organism. Organisms depend on these interactions to obtain its vital needs. For example an owl will make its nest in a cactus to survive the conditions or a tick will live off of the resources found from another animals body.
Abitoic factors are non-living things that an organism needs to survive. Abiotic factors in the desert include water and shelter. Water is needed to hydrate the organism's body and keep it's bodily functions working correctly, whereas shelter is needed because the climate, weather, and environment of the desert biome is very demanding of an organism. Unlike biotic factors, these are essential to every organism.