imagine you have a radioactive sample containing both virtualium and decayed atoms of virtualium. After analysis, you find it contains 10 atoms of virtualium and 40 decayed atoms how oldf is your sample? hint you must use the half-life of virtualium determined earlier in the activity

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

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.