It is b cuz i had this question b4
There is proof of it. Such as fossils, records, videos, etc. Dinosaurs and Thylacines for example. Both of these have been extinct for quite some time. Although there is footage of some Thylacines there isn't any of any Dinosaurs. However, there is fossils and bones found from Dinosaurs. There has been fossils from many extinct animals dating back millions of years, therefore proving its a common event through history.
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The behavioral activation system is associated wit PLEASANT MOOD. Behavioral activation system is neuro-behavioral system that control positive affect and stimulate appropriate behaviors in response to rewards based on personality factors. The system is associated with low to moderate arousal, pleasant mood and tendency to approach new objects.
