What happens to the number in a measurement that is converted from kilometers to meters

You multiply the number by 1000 when you convert a measurement from kilometres to metres.

The prefix kilo means ×1000, so

1 kilometre means 1 metre ×1000.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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