Foods that are capable of supporting rapid growth of micro-organisms are called:

Foods that can promote the growth of microorganisms are classified as Potentially Hazardous foods. These types of food such as eggs, meat, sprouts melons etc are good mediums for the growth pathogens because they contain high levels of protein on which the microorganisms can feed. To prevent the microorganism growth on this food, it should be kept in a temperature controlled environment like the refrigerator which can slow down or inhibit bacterial cell processes. 

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

When the sun hits the plant and the plant has water