Why is it paradigms if exemplar and paradigm are synonyms?

pls provide explanation for this text

Scientific discovery is generally (i) ______ process, building on and supplementing the discoveries made by previous researchers.

USUALLY THE DISCOVERIES ARE a process of add up, one after one another. So the first blank is cumulative


But those discoveries that tend to alter the trajectory of human thought are often made in isolation of previous (ii) ______

Shift word BUT: sometimes the trajectory is unusual so the previous paradigms (discoveries) are isolated processes

Darwin's discovery of evolution, for example, though mainstream today, was not obviously (iii) _______ by the work of any naturalists before him.

for example Darwin's theory, which now is common to know, at the time was not anticipated by anyone at the time

Ask or further assistance

Could you please explain how is the last sentence of the text connected with the first two? I mean, Darwin's work could not have been anticipated by the work naturalists before him but how does this connect with the idea that some discoveries are isolated from the previous ones?

How do we select between Option E. exemplar and Option F. paradigm?

Carcass,

Paradigms and exemplars are same in meaning so which one to select depending on the context.

Good question but I think is pivotal your knowledge comes into the picture.

It is true that exemplar means a role model and paradigm as well. But when it comes to research or new discovery the paradigm is what we use to

Since we do need a concept that will be the bedrock years to come


Regards

i think this question have a Grammar error (of previous (ii) ______ "",""Darwin's discovery of evolution) a comma should be inserted here

at all.

Inserting a comma ther where you do not have two independent clauses and join with a comma which is a comma splice

GBut there you do not have both

This does not seem like an official question, while correct otherwise, the choices - Examplar and Paradigm are nearly synonymous and only differ by supposed usage in particular contexts. Not a solid reason imo.