An analogy to cytoplasm (comparison) or an easy way to remember it (example: the nucleus is like the office of the school, it makes sure everything is running smoothly) answer the question!

relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone.

i'd say that the moon rock is about 2.2 billion years old.