Agroup of stars, gas, and dust held together by gravity is a a. galaxy c. local group b. constellation d. both a and b

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

The chemical form of energy that is useable by the cell to do work

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?