The correct answer to this open question is the following.
Although you did not clarify what kind of temples among the many ancient temples you are referring to, we can say the following.
The main purpose of the archaeologists who first investigated the old temples, in general, was to dig in deeply to know the purpose of the temples, why the temples were built in the first place, what was his main use, how ancient people built temples with the lack of proper technology or tools, and how these old temples had endured the test of time.
Even to this modern-days, scientists and archeologists do not have a true and definitive statement about pyramids, temples, ziggurats, and other ancient temples and sites, it is just theories.
And regarding your second question, the plural of the word sarcophagus is sarcophagi.
Unions were very effective in shaping political and economic policies. Even though their initial efforts did not have success in the late 19th century, their 20th century efforts changed America forever.
For example, the labor unions were able to get the government to pass laws regarding the 8 hour work day, the outlawing of child labor for kids under the age of 16, and the implementation of health and safety regulations to ensure that factory workers were in suitable conditions. Along with this, there are now federal agencies that to this day, continue to monitor businesses and their activities to ensure that they are not breaking any labor laws or health and safety regulations.
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i hope it helps and best of luck ♥