Cómo elegir entre los huevos codigo 3, 2, 1 y 0

How to choose between free-range, free-run, organic and conventional eggs

Eggs can come with a lot of labels these days — free-range, organic, cage-free. How is a consumer to know which ones are the best choice?

http://www.chatelaine.com/health/how-to-choose-between-free-range-free-run-organic-and-conventional-eggs/