What are the 4 different types of bases in DNA and how do they pair?

the 4 different types of bases - adenine, thymine, cytosine, and guanine

adenine always pairs with thymine, and cytosine always pairs with guanine.

(dont know how they pair)

Explanation:

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.

maybe because its impossible for balloons to lift a whole entire house.