41:07 Knowledge of atomic structure has evolved over time. Thomson discovered that atoms contain electrons, Rutherford
discovered that most of the mass of an atom is concentrated in its center, and Bohr discovered that electrons orbit the
nucleus
Taken together, what do these discoveries demonstrate?
O the cumulative nature of science
O the quantitative nature of science
O the importance of thorough review of scientific papers
O the importance of not publishing science until it is final
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x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

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.

what questions are you talking about ?