Cyclins are proteins produced in cells only briefly, at specific stages of the cell cycle. These cyclins regulate the activity of kinase proteins, which help to move the cell to the next cell cycle phase. If regulation of cyclins or kinases is disrupted, the cell division process can go awry. In your Evidence Notebook, develop a model describing the interaction of cyclins and kinases, and predict what might happen if cyclins were produced constantly throughout the cell cycle

i think the answer would d

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.

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )