I think it’s C because weather forecasters use a doppler radar to predict storms that can’t be seen and X-Rays are used to detect breaks in bones that can’t be seen as well. Weather forecasters use radar to
help locate and track severe weather events such as thunderstorms and tornadoes.

Which action is most like the use of radar by weather forecasters?
A. Prisms are used to split white light into different colors.
B. Sound waves are used to communicate across a field.
C. X-rays are used to locate breaks in bones.
D. Sound waves are used to locate underwater objects.

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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.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.