What is a scientist who studies patternes of diseases called?

The code of ethics of the sets forth certain basic standards that sociologists must follow in conducting research. question 14 options:

Which of these was not a key difference between northern and southern states at the constitutional convention? wanting to protect states’ interests vs. a government with strict rules having more, larger cities vs. having fewer, smaller cities wanting to protect agriculture vs. protect industries having many enslaved people vs. using less enslaved labor

Who gave the famous "i have a dream" speech at the march on washington?