Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell's genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus. Changes in chromatin structure are associated with DNA replication and gene expression.
Heavy rain fall in a region means that the river will expand in size to accommodate the xtra h20. it reshapes the shore line. moving h20 over time can change the land features.
