Question

which characteristic is associated with viruses rather than microorganisms? they are extremely small. they have specific morphology. they are not living by definition. they have no oxygen requirement.

Explanation:

Viruses are acellular entities that do not meet all the criteria for living organisms such as being able to carry out metabolic processes on their own. Microorganisms like bacteria, fungi etc. are living. While both can be small, have specific shapes and may not require oxygen, the key - differentiating factor is that viruses are not living by definition.

Answer:

They are not living by definition.