According to an American Cancer Society's annual report published in December 2009, the U. S. cancer death rate continues to decline, as it has since the 1990s. This may be attributed to all BUT ONE of these factors.

0)

A)

early screening

B)

fewer people smoke

C)

genetic engineering

D)

healthier diet and less obesity

C

Explanation:

The reduced rate of cancer deaths in the United States may be attributed to all of the factors except genetic engineering. Early detection and a healthier lifestyle are the main contributors to the reduced incidence of cancer as well as the reduce death rate.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.