If your iron is low, eating a diet that is high in iron-rich foods such as fortified cereals, red meat, dried fruit, and beans may not be enough to give you what you need. Your doctor might recommend that you take an iron supplement.
selective. 1  having the function or power of selecting; making a selection. 2  characterized by selection, especially fastidious selection. 3  of or relating to selection. 4  Electricity, Radio. having good selectivity.
Selective breeding is selecting breeding animals based on characteristics that are desirable in order to reproduce them in future generations. Humans selecting cows with the biggest udders ( which incidentally increased milk production in North America 300% from the time the Declaration of Independence was signed.)