explain why a change in a shape of an activity site denatures an enzyme and discusses the impact on chemical reactions that relies on an enzyme that has been denatured

When the particles mix with other types of substances the Enzymes will collect the proteins causing the main object to Rust, Desolve, or liquify, sometimes even harden. But in the cases of it denaturing would be for the enzyme to eat up unwanted nutrients or germs like alcohol would for a wound, disinfecting or preventing the item from becoming sick, molding, Ect.

b.have there own function.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.