Studies indicate that for every square metre of area, a lake has 150 g of producers, 16 g of herbivores,
and 4.5 g of carnivores. This data may be used to draw a
(a) a pyramid of numbers
(b) an energy pyramid
(c) a pyramid biomass
(d) a pyramid showing the number of KJ for each trophic level

prism b but im not for sure

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

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.