That is true, enzymes are specific.
Fingerprints are still recoverable for long lengths of time, about 6 weeks, so you would still have the fingerprint ( no DNA profiling ) so you would likely be fine if it wasn't there for long.
Answer:
A
Explanation:
if you hide a storm drain it really doesn't do much because it doesn't clean the water, and all of the other options do clean water of contaminants.
