Slavery looks to be the right answer
The correct answer to this open question is the following.
You did not include any reference, text, or further context. We do not know what is the topic of controversy.
However, by doing some research we can help you with the following.
If you are referring to the controversy between formal science vs. pseudoscience, then the issues or problems that tend to lead to such controversies are the lack of evidence used by pseudoscientists when trying to prove something.
True scholars and scientists know that the scientific method is the only way to validate a phenomenon. The results can be repeated one, two, and three times, and scientists had to validate the results every single time. Then, we can say that something has scientific support and validation.
On the contrary, pseudoscientists often times do not include validation, just opinions, and general comments based on their own perspectives.
After the Ten Plagues, Moses led the Exodus of the Israelites out of Egypt and across the Red Sea, after which they based themselves at Mount Sinai, where Moses received the Ten Commandments. After 40 years of wandering in the desert, Moses died within sight of the Promised Land on Mount Nebo.
Nikolai II Aleksandrovich