What 2 factors effect enzyme activity the most?

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?