How Have Most Data on Environmental Hazards Been Obtained? (Select

How have most data on environmental hazards been obtained? (Select all that apply.)

A) Through data obtained after large amounts of toxic chemicals are accidentally released
B) From descriptive research done by occupational health physicians
C) From research involving random clinical trials in a controlled laboratory setting.
D) Through the systematic use of government-obtained data from required state reports
E) By toxicologists examining the effects of chemicals on animals and assuming humans may be similarly affected
F) When occupational exposure is correlated with health problems later