The waxy coating is a lipid that can help prevent excess water loss in dry environments.
Prokaryotic cells do not have a nucleus.
Building models doesn't actually help scientists observe phenomena. Scientists build models to describe how nature and systems operate then make observations to see if their models match what they observe. Models which don't match what they observe are either alterated or scrapped. Good models are kept and used by the scientific community.
No.... the weight of a substance is the mass of the substance multiplied with the acceleration due to gravity on it.
