Primary succession is when development of an area that has not had a community begins.
Secondary succession is when a community starts to rebuild itself after a disturbance(Like a hurricane or tornado).
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Primary succession occurs in areas that have never been inhabited before, such as a newly formed volcanic island, while secondary succession occurs in areas that have been previously inhabited, such as after a fire or human disturbance. Primary succession starts from bare rock or soil, while secondary succession occurs on existing soil with some remnants of the previous community.
Primary succession occurs after the complete wipe out of vegetation. After the wipe out occurs, small shrubs and grasses grow. Secondary succession however, occurs when there has been destruction to the land, but not enough to completely devastate the area. Hard woods grow during secondary succession.
A primary infection occurs when the body is exposed to a pathogen for the first time, while a secondary infection happens when a different pathogen infects a body already weakened by a primary infection. Primary infections may lead to the development of immunity, while secondary infections can occur in individuals with compromised immune systems.
Primary endocrine pathology refers to dysfunction within an endocrine gland itself, causing abnormal hormone production. Secondary endocrine pathology results from dysfunction in the pituitary gland or hypothalamus, leading to inadequate stimulation or suppression of hormone production in the target endocrine gland.
The band of cartilage between the primary and secondary ossification centers is called the epiphyseal plate or growth plate. It is responsible for longitudinal bone growth in children and adolescents.
A primary cell cannot be recharged whereas a secondary cell can be recharged. In a primary cell chemical reaction is irreversible whereas in a secondary cell chemical reaction is reversible. ... A primary cell is light and less expensive whereas a secondary cell is heavy and expensive.