Answer:
Amount of sleep
Explanation:
Sleep is vital for performing any kind of task in our everyday lives. The other answers aren't as important.
Answer:
Start recycling, walk or bike instead of drive, print as little as necessary, turn off the lights whenever you leave the room, use paper bags instead of plastic bags
The answer is ophthalmologist
D) increased breathing rate for a shorter period of time
The blood type of the person donating the kidney must be compatible with the recipients blood type