E Describe how increasing salinity afects the amount of fluid ejected each time a
contractie vacuole contracts. Calculate the water potential of an animal cell without
contractile vacuoles if water enters the cel and creates a solute potential of -2. Assume
that the pressure potential in the cell is 0

the sun d the answer is sun

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.