The mucosa of the cervical canal (endocervix) is composed of a single layer of mucin-secreting columnar epithelium, which covers the surface and the underlying glandular crypts. Isolated neuroendocrine epithelial cells of argentaffin type or argyrophil type are admixed with the normal endocervical cells.
Eutrophication can also occur as a result of natural events, such as climate change and geology. However, natural eutrophication is dramatically increased by human activity. The main difference between anthropogenic eutrophication and natural eutrophication is that the natural process is slow. Learn more about Botany
The most common nutrients causing eutrophication are nitrogen and phosphorus. The main source of nitrogen pollutants is run-off from agricultural land, whereas most phosphorus pollution comes from households and industry, including phosphorus-based detergents.he enrichment of water by nutrients can be of a natural origin (natural eutrophication) but is often dramatically increased by human activities (cultural or anthropogenic eutrophication). Natural eutrophication has been occurring for millennia.