A recessive trait is defined as A. one that is expressed when the dominant allele is not present.

B. one that is never expressed.

C. one that is always expressed.

D. one that is expressed whenever it is present.

Recessive traits are traits carried in a persons genes without being expressed because they are masked by the dominant trait. Therefore the answer is A.

Explanation:

Recessive traits can be expressed so B is incorrect. It is not always expressed so C is incorrect. Just because a recessive trait is present does not mean it will be expressed, and if that were true it would always be expressed, so D is incorrect as well.

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.

well the answer is 2!