What sources of data are used by demographer

Some demographic data sources are surveys, samples, census measurements, fieldwork, and observation. When using surveys, demographers research through asking questions to select members of the population. When using samples, demographers look at a small portion of the population as a sample group, then apply statistics to the population overall. Census measurements allow demographers to collect data from all residents of a population. Fieldwork is used to conduct studies and surveys out in the population itself (rather than in isolation). Observation is used to monitor and record the behaviors of a population to understand it better.

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explanation:

can i have brainliest i need one

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."