Â­Mesoamericans began writing during the mid-Pre-classic period. The Mayans were the first to keep any sort of historical record, and the beginnings of the calendar were born. The Mayans used stelae, or stone monuments, to carve their civil events, calendars and astronomy knowledge. They also inscribed their religious beliefs and mythology on pottery.
The nucleus is a membrane bound structure that contains the cell's hereditary information and controls the cell's growth and reproduction. It is commonly the most prominent organelle in the cell. The nucleus is surrounded by a structure called the nuclear envelope.
The nucleus of the plant cell is structurally and functionally very similar to the nucleus of an animal cell. It is a discrete organelle, usually centrally located, that is bo â¦ und by the nuclear membrane and functions to both store and regulate the transcription of the genetic material of the cell.ike a brain. It holds DNA information and chromosomes. It releases ribosomes, which are small, dark structures that float around in a cell. They create proteins. But the only difference between the nucleus in plant and animal cells is what it directs.