.An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be

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

a is the correct answer

level 4 to level 2 : ))