Actually cell can get big but they are smart enough to stay small and live off lots of small food, and there isn't enough food for them to live off of (if this is wrong i apologize)
Answer:
As it developed, humanistic psychology focused on each individual's potential and stressed the importance of growth and self-actualization. The fundamental belief of humanistic psychology is that people are innately good and that mental and social problems result from deviations from this natural tendency.
You have no obligation because its none of your buisness
