What were the first thermometers made of and what liquid was inside

How did presidential reconstruction allow black codes to be passed

According to the federal regulations, human subjects are living individuals about whom an investigator conducting research obtains information through interaction or intervention with the individual, and uses, studies, or analyzes the information; or:

What conclusion can you draw about the connection between religion and feudalism? a. feudalism worked best in christian societies. b. feudalism could not operate in a society that was religious. c. feudalism was not successful in buddhist societies. d. feudalism could operate in societies with different religions.