Mutations can occur naturally during normal cellular processes or be induced by an environmental factor. True Or false

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.

layer 3 is younger than layer 6.

69 is the correct math for the amino acids