When the concentration of substance B in the reaction above is doubled, all the other factors being held constant, it is found that the rate of the reaction remains unchanged. The most probable explanation for this observation is that:

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

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.