What is the function of feeling the sensation of hunger?

Hunger is a normal sensation that makes you want to eat.

Explanation:

Your body tells your brain that your stomach is empty. This makes your stomach growl and gives you hunger pangs. Hunger makes some people feel lightheaded or grouchy.

from:

Hunger, Fullness, and Appetite Signals | Michigan

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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