Radon-222 is a colorless, odorless gas that forms

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.