if am i ending my sentence with the word 7 a. m., which is correct?

a. 7 a. m. (one period because it is the end of the sentence)
b. 7 a. m.. (two periods because of the one after the letter "m" and the period at the end of the sentence)

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.