Affiliate Marketing Secrets

For my science project I’m making multiple choice questions and one of them is which of the following is not an example of ecological niche. So far I have true statements, but I need one that’s false. Give me an example please 🙂

Umm,I don’t know how to put it…..a niche is like …………….a habitat is a place of living…..but a niche…is something that helps that being prosper…..like,I’m a guy,I live in the hood,I went to high school,tried some sports,and found that my niche is running (I.e.cross country and track),I’m good at it

I don’t get what a niche is… 🙁
I know its a role of an organism in an ecosystem that allows it o survive, grow and reproduce indefinitely, but does anyone have an example?

in marketing a term niche marketing is used. why is it important for a marketer to focus on a niche segment. explain with the help of an example.
P.S pls give a proper answer .. this question is going to come in my exam .. its a 10 marks question …. and plsss give a proper example too … very urgent …
thanks in advance 🙂

I have a few affiliate programs that a few extra bucks from and I would like to know where are some good places to advertise these products/services for free online. (example.. forums, sites etc.)