What would the temperature be in the atmosphere in 2 km?

What is the difference between an observational study and an​ experiment? choose the correct answer below. a. in an​ experiment, a treatment is applied to part of a population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. b. in an​ experiment, a treatment is applied to an entire population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of an entire population but does not change existing conditions. c. in an​ experiment, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. in an observational​ study, a treatment is applied to part of a population and responses are observed. d. in an​ experiment, a researcher measures characteristics of interest of an entire population but does not change existing conditions. in an observational​ study, a treatment is applied to an entire population and responses are observed.

The smith family has very little money and no health insurance. a researcher approaches them and promises free healthcare for their three children for 2 years if he can subject the children to a series of experimental vaccines that may have serious side effects. the smith family feels compelled to participate to get the free health care. according to the apa code of ethics, this researcher is in violation of the principle of:

What was built during the mughal rule of india? the silver pavilion the taj mahal the dome of the rock the eiffel tower