To properly record a measurements, you must record which of the following? (pick as many as you want)
a. number
b. hypothesis
c. summary
d. unit

TO properly record a measurement, it is a must to record the unit of measure of a certain object that you wanted to measure.
When you say unit it means, that the length, width and height. It may also be the radius, diameter or circumference.

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.