Question

A body of knowledge must be _____ in order to be considered science.

Answer 1

It must be observable and testable for the following reasons: it doesn't have to be "realistic", because not all science

Answer 2

The given blank can be filled with observable and testable.

Step-by-step explanation:

A body of knowledge needs to be observable and testable so that it can be regarded as a science. It cannot be realistic, as if it is then one cannot learn anything innovative. It cannot be factual, as it needs to be functional, and it can also not be reliable as science can change, thus, it is to be observed and tested at each step.