researchers compare the body composition of cattle feeding on a grain diet with that of cattle feeding on a…

researchers compare the body composition of cattle feeding on a grain diet with that of cattle feeding on a grass diet. this method of gathering data is classified as\n\na census.\n\na sample survey.\n\nan experiment.\n\nan observational study.

researchers compare the body composition of cattle feeding on a grain diet with that of cattle feeding on a grass diet. this method of gathering data is classified as\n\na census.\n\na sample survey.\n\nan experiment.\n\nan observational study.

Answer

Brief Explanations:

A census involves collecting data from an entire population. A sample survey selects a subset of the population. An experiment involves manipulating variables. Here, researchers are just observing the body - composition of cattle based on their natural diet (grain or grass) without any manipulation. So it's an observational study.

Answer:

D. an observational study