Điều kiện ra đời chủ nghĩa Mác

Which statement best describes the weather shown by the red semi circles on a line on a weather map a warm front brings drizzly weather a cold front can cause heavy rain, thunder, and lightning a stationary front may produce rainy or snowy weather for several days an occluded front can cause light to heavy precipitation that may last several days

How does sociology account for the cause of drug and alcohol addiction?

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.