you bite into a fruit it tastes bitter it could be poisonous. you spit it out, what has happened to the nervous system that makes you do this?

Your sense of taste protects you from unsafe foods. If you ate poisonous or rotten foods, you would probably spit them out immediately, because they usually taste revolting. That way, you stop them from entering your stomach.

Your taste buds also detect the taste.

Your sense of taste also helps you maintain a consistent chemical balance in your body. Liking sugar and salt for example, satisfies your body's need for carbohydrates and minerals. Similarly, eating sour foods such as oranges and lemons supplies your body with essential vitamins.

coal is not sustainable because it will one day run out.

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