After conducting an experiment, a student realized that his hypothesis was incorrect. what is one thing that student should not do in this instance?

Dont change his hypithesis,cause its okay for him to guess wrongly as hypothesis is just a guess

Not change there answer to the correct answer

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.

Yes it would be a physical change.