The three elements that are necessary for a thunderstorm to form are

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

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content