Answer:
D: more land is being farmed
Explanation:
This is the same thing as over farming.
Irrigation systems are used to work the entire day with no stop, using so much water and allows water to be over used. Many farms now use irrigation systems. You have to think about where the answer D goes to: more farms = more water usage for plants, crops, utilities, animals.
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Answer:
the result of each human voice having a distinctive timbre
Explanation:
Each individual has a voice as unique as their finger prints, this is the reason you can tell the voices of people apart. Assuming every human sounds the same, it would be difficult to differentiate callers on phones. The distinct timbre of the human voice is as a result of the complex processes by which voices are produced, the activity of the lungs, voice box, larynx in voice production.