What does variation mean when referring to the layers of the atmosphere

What causes an unsaturated fatty acid to have a different shape than a saturated fatty acid? o a. unsaturated fatty acids have more hydrogen atoms. o b. unsaturated fatty acids have double carbon bonds. o c. unsaturated fatty acids have more nitrogen atoms. o d. unsaturated fatty acids have single carbon bonds.

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Which statement best describes the role of religion and culture in ancient medicine?