To be effective, key choices must me
a parallel
b broad
c specific
d diverse

The correct answer is A) parallel.

To be effective, key choices must be parallel.

A key is a device that allows biologist to identify an organism. These keys have contrasting statements required to make comparisons. We are referring to taxonomic keys that identify species or animals. When scientists try to identify an unknown organism they use taxonomic keys to do their research.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

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.