Biology, 30.10.2019 04:31 billycain9647
Residents of three villages with three different sources of water supply were asked to participate in a survey to identify cholera carriers. becuase several cholera deaths had occurred lately, nearly everyone agreed to be examined. the proportion of residents in each village who were carriers was computed and compared. what kind of study was this? a. cross-sectional study
b. case-control study
c. prospective cohort study
d. retrospective cohort study
e. experimental study
Answers: 2
Biology, 22.06.2019 10:50
Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%
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Biology, 22.06.2019 15:30
Bio molecules are essential to all living things. which biomolecule is “d” from the table
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Biology, 22.06.2019 17:30
The krebs cycle is also known as the calvin cycle pyruvic acid cycle carbon - oxygen cycle citric acid cycle
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Biology, 22.06.2019 17:40
You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum
Answers: 1
Residents of three villages with three different sources of water supply were asked to participate i...
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