Answer:
In the microscopic level you can use non-toxic chemicals etc and you can aslo keep the food in desirable temperature inorder to prevent it from being rotten, incase of some food get contaminated you can just not use it because it can make you sick or if it only partly contaminated, then you can use the uncontaminated part of it and not use the other part.
I feel Schizophrenia could be best treated with behaviourism.By this therapy the harmful behaviour due to psychological trauma of the patient could be avoided. Neurobiology would in no way be of help to these patients.This problem cannot be solved with a research on anatomy as it is a problem of mind. Counselling can help a lot.
<span>d. tarnishing is a chemical change. </span>