2 Points
Which of these is an advantage of hydroelectric energy?
O
A. Is available in limited areas
O
B. Is a renewable energy source
O
C. Harms aquatic organisms
O
D. Is expensive to build or maintain

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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.

c should be the answer

the correct answer to this question is #5