Formaldehyde is a substance made up of three different types of atoms that are chemically combined in a fixed ratio. As which type of matter is formaldehyde correctly classified?

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

the answer is d.) potassium