I believe you're talking about a population.
Answer: Operant Conditioning
Some bears must have had undergone operant conditioning that is why they open their mouths for teeth cleaning and present their paws for nail clipping.
Operant conditioning is a form of learning in which a reward or punishment is given for some voluntary behavior.
Bears that have undergone operant conditioning are called food-conditioned bears. They are dangerous but learned to approach humans, or frequent human-occupied sites, in search of food (reward).
East or west because of the being of north and south which the latitude is on the equator
So that over time they can adapt to survive
It is the final electron acceptor the goes on to bond with 2 molecule to make water.
