Explain what each arrow in the picture represents

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 maximum mass of nh3 is nh3 in grams

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.