Ineed this done answer i will give brainest or what ever i will give 84 points

explain how dna and rna lead to the expression of traits

DNA and RNA are the genetic code. They are passed form the ancestor to offspring. They code for a mix of traits from the parents and tell the cells what to do what traits to form, and overall how to function

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.