EXPLAIN Describe the patterns you see among the chemical formulas. How does the placement of the elements on the periodic
table appear to relate to the numbers in the chemical formula?

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

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

the answer is option a.