you cant
herbicides are chemicals that kill plants whereas pesticides are chemical substances that kill pests (insects....)
Sometimes. All herbicides are pesticides, but not all pesticides are herbicides. A pesticide is any material used to eradicate or suppress any other life form which causes a material or economic loss...
Soil, water, and food from getting contaminated by pesticides :D.
yes it kills plants :(
No. It doesn't stay once you wash your vegetable or fruit thoroughly