To study the possible causal relationship between smoking and lung cancer, researchers start with human _ studies and then progress to animal _ studies. a. experimental; experimental b. experimental; quasi-experimental c. quasi-experimental; experimental d. correlational; quasi-experimental

To study the possible causal relationship between smoking and lung cancer, researchers start with human "quasi-experimental" studies and then progress to animal "experimental" studies.

Explanation:

“The causal link remains to be established'' between smoking and lung cancer. He alleged the institute documented that ''smoking has been shown to be an significant risk issue in heart disease, lung cancer and emphysema. About 10 to 15 percent of smokers develop lung cancer — although they often die of other smoking-related causes like heart disease, stroke or emphysema. Cigarette increases the risk or getting organ cancers. There is a strong relationship between cigarette and oral cancer, larynx, esophagus, pancreas, bladder, lung and endometrial carcinoma. Cigarette increases the death risks of lung, head and shoulder, urinary system, pancreas and bladder cancer

To study the possible causal relationship between smoking and lung cancer, researchers start with human _____ studies and then progress to animal _____ studies. a. experimental; experimental b. experimental; quasi-experimental c. quasi-experimental; experimental d. correlational; quasi-experimental

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To study the possible causal relationship between smoking and lung cancer, researchers start with human _ studies and then progress to animal _ studies. a. experimental; experimental b. experimental; quasi-experimental c. quasi-experimental; experimental d. correlational; quasi-experimental