How to do this question plz answer me step

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

explanation:

0.07 g/cm³

1.37 g/cm³

it's c (engineer's do their work with mechanical stuff not on any living being)