Suppose that the distance between two genes on a linkage map is 7 units. the cross-over frequency between the two genes is

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.

the titanic would be the correct answer

answerblank(1); ecological; blank(2); evolutionary;