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.
Your question is flawed. A codon is a unit of genetic information, just a tiny three-letter one. A gene is a unit of genetic information, just a larger one. However if the original question was multiple choice and went like this: A gene is: 1. A segment of DNA that carries a unit of information.2. One arm of a single chromosome 3.A segment of DNA that is three nucleotides long. 4. The protein that results after translation is complete A gene is not 2, 3, or 4. 1 is the only option left.. One arm of a single chromosome 3. A segment of DNA that is three nucleotides long. 4. The protein that results after translation is complete A gene is not 2, 3, or 4. 1 is the only option left.