Affiliate Marketing Secrets

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?

1.
Cougars are predators that often eat weakened or diseased animals. This is a description of the _____ of cougars.
(1 point)
•habitat
•community
•niche
•none of these
3.
____________________ are characterized by complex food webs, many different species of organisms, and little or no succession.
(1 point)
4.
The first organisms to appear in an area undergoing succession are known as ____________________.
(1 point)
5.
The effect of movement of people between counties has _____ effect on total world population.
(1 point)
•a damaging
•little
•a great
no