When two mechanical waves have a displacement in the same direction, and they overlap, what will the resulting wave look like and why?
a. the new wave will have the same displacement as the original waves due to constructive interference.
b. the new wave will have a smaller displacement than either of the original waves due to destructive interference.
c. the new wave will have a greater displacement than either of the original waves due to constructive interference.
d. new wave will have the same displacement as the original waves due to destructive interference.

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 alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question

copper and glass have high electrical conductivity