Answer:
c. Observational studies have both independent and dependent variables.
d. Observational studies can be used to test hypothesis.
Explanation:
Observational studies are ones in which a researcher makes observations about his thoughts and views. He observes the risk and other effects before actual test takes place. This is usually the initial phase of research where observations are made for suitability of certain things that are to be researched. There is initial feasibility test conducted to identify whether the further research process is beneficial or not.
The correct answer is letter C. It is also known as "lightning war." A military tactic that occurs fast and attacks the enemy's weak points through the use of armor and air power. This type of tactic preserves innocent human lives and lessens artillery cost.
Answer:
It had the king at the top with all of the control, and the peasants at the bottom doing all of the work.
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<h3>Answer:</h3><h3>Harmony and variety are really opposite expressions of the same nebulous concept. To emphasize one is to de-emphasize the other. Harmony and variety play tug-of-war in a composition.</h3><h3>Explanation:</h3><h3>Harmony -the combination of simultaneously sounded musical notes to produce a pleasing effect.</h3><h3>society-the aggregate of people living together in a more or less ordered community.</h3><h3>variety - the quality or state of being different or diverse; the absence of uniformity or monotony.</h3>
