A is a segment of dna witch codes for pacfic trait

A gene is a segment of DNA witch codes for specific trait.

Explanation:

DNA is the molecule that contains all the genetic information of living beings, which is used for the synthesis of proteins, that will serve to give structure and function to these organisms.

Each DNA molecule forms a chromosome, and segments of the DNA of that chromosome contain the information that constitutes the genes. Each gene formed by a fraction of the chromosome's DNA encodes the synthesis of proteins that define specific structural or functional traits.

i think the answer is gold im not entirely sure

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.