Only for those groups have scientists almost completely identified all the world's species. Biologists have yet to describe many species of plants, invertebrate animals and lichens. So the number of these species known to science increases substantially every year.
The interglandular tissue is also increased in quantity, and is crowded with large round, oval, or polygonal cells, termed decidual cells. Their enlargement is due to glycogen and lipid accumulation in the cytoplasm allowing these cells to provide a rich source of nutrition for the developing embryo.rom Wikipedia, the free encyclopedia. Before the fertilized ovum reaches the uterus, the mucous membrane of the body of the uterus undergoes important changes and is then known as the decidua.
Quick Answer. Cheek cells are generally irregularly shaped and are always flat cells. The cells are made up of many parts including a very thin membrane on the outer part of the cell. Cheek cells are among the most popular cells that are studied in a classroom setting because they can be obtained from a person in a minimally invasive way. They are easy to view under a microscope and can give students an idea of what is truly going on in their mouths.