Human hair can endure for several years, often 2 years, before decomposing along with softer tissues. Hair, like fingernails, is made of keratin and is much more durable than skin and flesh.Continue Reading
Decomposition is heavily affected by the environment in which it occurs. While most microbes, rodents and insects do not eat hair or fingernails, they can hasten the overall process. In a sealed grave the entire process occurs much more slowly, sometimes on the order of years. If exposure to soil is direct, or if the corpse is left unburied and exposed to the wind, then decomposition occurs with much greater rapidity.
Keratin resists the enzymes that encourage decomposition. This process is called proteolysis and it breaks down fleshy tissue with extreme rapidity. Environmental stress like moisture and invasive plant growth are more influential in destroying keratin, though eventually the process of decomposition does take its toll on the materials involved.
In some extreme cases when a corpse has been preserved through artificial means, hair and fingernails may endure far longer than is typical. This period can last for decades or even centuries, although it requires a very sterile environment and the careful maintenance of the tomb or sepulcher in question.Learn more about Human Impact
Overall, the human impact on the biosphere has been negative and will most likely lead to the degeneration of the ecosystem. The biosphere is the sum of all ecosystems on Earth, and the human race has had an influence on all of those systems, including space.Full Answer >
Australia's human-environment interaction includes the burning of vegetation, the introduction of weeds and plants to the continent and the modification of the Murray River. Human-environment interaction describes how people use the environment, adapt to it and change it to suit their needs.Full Answer >
A positive human impact on the environment occurs when a person takes action to improve society, nature and its resources. Acting positively, even in a small manner, has a major impact on the environment, especially when it is done consistently.Full Answer >
Human activities have impacted the environment more than any other species, including deforestation, natural resource depletion, reduced biodiversity, and pollution of the air, land and water. Humans have been impacting the environment for thousands of years; however, since the industrial revolution in the 1800s, the impact has drastically increased due to increased population, industrial manufacturing and agricultural practices.Full Answer >