AHIMA offers two levels of certification: the entry-level Certified Coding Associate (CCA) and the mastery-level Certified Coding Specialist (CCS). A high school diploma or equivalent is needed for the CCA certificate.
1833: English Botanist Robert Brown discovered the nucleus in plant cells. 1838: Matthias Jakob Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. This statement of Schleiden was the first generalizations concerning cells.
Plant cell types divide into sclerenchyma, parenchyma cells and collenchyma cells. A plant cell includes a nucleus, cytoplasm, chlorophyll, membrane, cell wall, leucoplasm, cytoskeleton, plastoids, each of them having their role for helping the plant grow and survive, as well as reproduction.