Tinea cruris, most commonly known as jock itch, is a fungal infection of the skin. It belongs to a group of fungal skin infections called tinea. Like other tinea infections, jock itch is caused by mold-like fungi, which are known as dermatophytes.
Ecologists (scientists who study the relationships of organisms with their living and nonliving environment) generally recognize two kinds of succession, primary succession and secondary succession. Primary succession takes place on an area that is originally completely empty of life. As an example, an area that has been covered by a flow of lava has, for a time, no life at all on it. Over a period of time, however, various kinds of organisms begin to grow in the area.
When secondary succession occurs, communities are usually reintroduced to the ecosystem more quickly than happens during primary succession. Plant and animal communities already existed before the disturbance that leads to secondary succession. Therefore, the soil is often richer than in areas where primary succession occurs. Also, some species may remain in the region after the disturbance.