Jenny, a scheduler at Mangel-Wurzel Transport, gets a call from a regular customer needing to move of rock and soil, which Jenny knows from previous experience has an average density of . Jenny has available a dump truck with a capacity of and a maximum safe load of . Calculate the number of trips the dump truck will have to make to haul the customer's load away.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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