A) Cellular level
B) Organismic level
C) Atomic level
D) Submicroscopic molecular level
Correct Answer: D
Solution :
Biological organisms starts with ubmicroscopic molecular level like viruses, bacteria, etc. These organisms are unable to be seen by naked eyes without the help of microscope or even electron microscope. Hence, the correct option is [d].You need to login to perform this action.
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