Why is left lung smaller than right lung

I guess I should guess sit correct.

Explanation:

if the left lung's size is equal to the right lung's size, then there wont be any space for the heart.

so the space left on your left lung is occupied by the heart.

hope it helps :)

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.