Which of the following can be made into crystal?
(a) A Bacterium
(b) An Amoeba
(c) A Virus
(d) A Sperm
Viruses are peculiar things as they are neither living nor non-living; they behave as living organisms inside the body but outside the body they are non-living. The collection of viruses forms a crystal which is used in scientific studies and research.
Crystal structure of hepatitis virus.
Therefore, option (c) is correct.