Answer:
D). They have not defined happiness or how it will be measured.
Explanation:
As per the question, the most consequential flaw or error in this study design is that 'Jean-Gabriel and Magali have not defined happiness and neither provided a description or method that describes how it will be measured.' This flaw would make the design ineffective as it would not be able to produce reasonable deductions or conclusions because they have decided that 'they would visit a mall to survey people of different ages' but this requires a scale on which they would measure happiness. <u>Since they have not mentioned any such scale which implies that they won't be able to collect data and hence, the study could not be taken forward.</u> Therefore, <u>option D</u> <u>displays the major error of this design that makes it invalid</u>.
Robert H.P Hill, JP !!
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Varied should be your answer
<span>Wetlands provide a habitat for many animals including fish, birds, reptiles, and other varieties of wildlife. Some of the species that make their home in the wetlands are endangered and are not able to live in any other place. Humans derive a benefit from wetlands as this land form plays an important role in purifying water for drinking.</span>
That solution would involve effectively burying the plant with sand and concrete to seal it off from the outside world – a tactic which, as the name suggests, was used at the Chernobyl power plant in the Ukraine after its explosion in 1986.
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