4. Because giant machines such as excavators can work so efficiently.
it has become cheaper to mine
ore deposits that were not
previously considered worthwhile.
What environmental concerns
must be considered as such
machines get bigger and more
efficient?

God is great

Explanation:

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