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Answers
Explanation:
1. Brain evaluate reward value and effort in the areas called Associative areas which are neither sensory nor motor. Emotions, Memory, Thinking and etc arises from here. All the pleasure (reward) is felt by neurotransmitters like dopamine and endorphins (that is the reason for drug addiction also.)
2. Brain alter perception and behaviour by previous experience by memory and adaptation at that time. For example if someone experience some sort of trauma they tend to avoid the cause next time like if someone is bitten by stray dog they tend to fear or hate next time
3. Simply to say our brain is plastic ( which means it can adopt easily by practice or some type of stimulus). Genetic factor include IQ, inherited disease and many more. Environmental contribution is learning new skill or adopting to stress changes the structure of brain slightly ( it is in terms of forming new connections between neurons and making effective transmission of impulse) not in terms of size.
Answer: