Maintain eye contact and do not cut the speaker off mid sentence. You should also appear interested and pay attention to what they are saying.
What name are you referring too?
The science of classifying animals is: TAXONOMY
There are many circumstances such as
1. Challenging upbringing
2. A series of bad/unfortunate events that affect the life of the person
3. Loss of a person
4. Mental illnesses
5. Bad health
6. Bitterness
and more!
You can find it from the internet
