What is the uncontrolled variable of this expirement: Does the shape of an ice cube affect how quickly it melts?

answer; protein;

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).