Answer:
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Answer:
D. differences; changes,
Explanation:
Cross-sectional research design: In psychological or scientific research, the term cross-sectional research is determined as an observational research design whereby an investigator or experimenter tends to measure and analyze the exposure and outcome of specific research participants or subjects at the "same time.
Longitudinal research design: In scientific or psychological research, the term "longitudinal research design" is also referred to as panel study or longitudinal survey and is described as a research design in which repeat observations of same research participants is being done over a long or short period in time.
In the question above, the correct answer is option D.
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Answer:
They are arranged by in order by the increasing atomic number.
Explanation:
The horizontal rows are called periods and the vertical columns are called groups.Elements in the same group have similar chemical properties.This is because they have the same number of our electron and the same valency.
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Where the leader of a country is the supreme authority on all issues, he is judge jury and executioner