Causes. Fungal nail infections are caused by various fungal organisms (fungi). The most common cause is a type of fungus called dermatophyte. Yeast and molds also can cause nail infections. Fungal nail infection can develop in people at any age, but it's more common in older adults. As the nail ages, it can become brittle and dry.
Photo: Getty Images. Jan. 1 marked a significant cultural shift in China â starting this year, families will be able to have two children. This alters the one-child policy that was introduced in 1978 to control the countryâs population.
Contents. 1  1 1. World population growth over time. 2  2 2. Demographic transition model. 3  3 3. Concept of overpopulation.  4 1  4. 5 A Case study â Chinaâs one child policy: