Which of the following has not yet been proven but will add support to the big bang theory if true?

the universe is expanding

overall density of ordinary matter must be roughly 4% of critical density

there is an abundance of the light elements h, he, li

there is a widespread cosmic microwave background radiation

ur answer is e & d

explanation:

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products