Kai began the research process by asking, "How does playing a musical instrument improve academic performance?" Now, he needs to modify his major research question as a result of his research. Which question narrows the focus of his research?

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either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.

i think the answer is c. she can't feel happy because things are moving too quickly.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.