What two elements have the same number of valence electrons a. rubidium and barium
b. sulfur and phosphorus
c. sulfur and selenium
d. xenon and nitrogen

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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