C is correct hope this helps you
Physical hunger shows itself with physical feelings of emptiness in your stomach, rumbling accompanied by weakness. Psychological hunger is simply the desire to eat, accompanied by no physical proof that it is necessary at that moment.
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The four scientific principles of sustainability are...
1. Reliance of solar energy
how much of the sun we reuse.
2. Biodiversity
When there is a large verity of species.
3. Nutrient Recycling
When a Population benefit from other populations.
4. Population control
When one type of population of species is to large.
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