the answer is because many of the concepts and ideas in theories are not directly observable.
For example, one of the most important theories that try to explain the formation of the universe is the Big Bang theory.
But, since this theory stated that the event happened million years ago, we couldn't make a possible effort to observe it and prove it's accuracy.
Answer:
Charlemagne ruled the Franks in the 700s.
Explanation:
google......but it okay
The scientific community and its research groups can also be considered as interest groups, as they will seek to organize themselves politically to defend the needs of their category. For example, a fertility research group can organize to require more resources for research in that area.