1.) how does the analogy of a lock and key to an enzyme and its substrate you to understand how enzymes function in the body?

2.) what does 'enzymes are specific' mean?

i think the answer would be a. after sentence 14! i hope i at least a little

a ratio derived from the equality between two different units that can be used to convert from one unit to the other. information obtained from experiments, sometimes called experimental results. the part of the experiment that is affected by the independent variable.