Which of the following are true about environmental epidemiologic studies?

a) cohort studies define subjects by exposure, which all participants have

b) case-control studies define subjects by health outcome, which only some participants have

c) cross-sectional studies determine the distribution of either a health outcome an exposure or both

d) case series studies define subjects by health outcome, which all participants have

d) all of the above

20 brainliest for whoever answers correctly and answers all choose the statements that accurately describe china's "one child policy." china's "one child policy" began as soon as the communists came to power. the "one child policy" was meant to keep the population from reaching 700 million. the "one child policy" was meant to slow china's population growth. the "one child policy" began as a result of the country's war with japan. some people were allowed to have more than one child. the "one child policy" began in 1979. the "one child policy" was most enforced in urban areas. the "one child policy" ended at the start of 2016. china's population is current just under 1 billion people.

Brazilians, like the u.s., communicate directly and you have to be careful with the use of slang. their communication style is a.low-context b. high-context

Name the peninsula that separates the bering sea from the sea of okhotsk?