1 the set of exogenic (physical, chemical and biological) processes that alter the physical and chemical state of rocks at or near the earth's surface.  intensity of most weathering decreases with depth, because variations in temperature and moistures decrease with depth.
A gene is a segment of nucleic acid that contains the information necessary to produce a functional product, usually a protein. Genes consist of a long strand of DNA (RNA in some viruses) that contains a promoter, which controls the activity of a gene, and a coding sequence, which determines what the gene produces.
DNA is made up of chromosomes and proteins. These chromosomes contain specific codes from your parents genes that come together and determine your characteristics.The genes in DNA that you receive are determined by if there are recessive or dominant. piece of DNA coding for a protein is called a gene. When the protein is produced, we say that the gene is expressed. Now a brain cell and a white cell have the same DNA, but they are very different because during and after their development, they express different genes.