The pericardial cavity separates the parietal and visceral pericardium
A mother passes on her mt(DNA) or mitochondrial DNA which sometimes includes genetic material but a father only passes down a Y chromosome if he has a son. No genetic material.
Enzymes speed up the chemical reaction that takes place in cells. they are also important for digestion and metabolism.
The law states that matter is conserved. It is not randomly llost or gained, but transformed.
This holds true because when a glass of water is left out over night, the water evaporates. The water doesn't magically disappear. It is just transformed into water vapor.
