Which age-structure pattern reflects a population with a declining population? A) the pre-reproductive, reproductive and post-reproductive age classes are of equal sizes

B) the pre-reproductive age classes are larger than the reproductive or post-reproductive age classes

C) the reproductive age classes are smaller than pre- and post-reproductive age classes

D) the youngest, or pre-reproductive, age classes are the smallest

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

the answer would be knowledge about cars!

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.