Which observational study design allows scientists to hypothesize a potential causal association?
select one:
a. case study
b. cohort study
c. cross-sectional study
d. case-control study

Case-control study is the observational study design which allows scientists to hypothesize a potential causal association.

Option C

Explanation:

Epidemiology deals with the agents related to public health in a specified population on the basis of the distribution and the determinants. Observational studies in epidemiology is used to draw inferences from a group of randomly selected people known as sample of the population. Case-control study comes under the "observational study" in which two groups which differ in their outcomes are being compared based on some casual attribute to draw inferences.

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

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1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.