Affiliate Marketing Secrets

Can someone please explain to me what a niche is? And differentiate it with a habitat (not like a huge paragraph just the main point)
So I’m stuck with this here. The Directions are to label the examples below either habitat or niche. (these are the numbers on the paper, I don’t want to get confused)
12. A chameleon changes its colors to blend in with its surroundings.
13. Ducks and amphibians live in or near a pond.
14. Birds nest in trees.
15. A male lion’s mane attracts a mate.
16. Your cat’s sense of smell helps it find its way home.
17. Monarch butterflies eat milkweed, making them poisonous to other species.
18. Woodpeckers use their beaks to pry insects from trees.
Please, somebody help me here!!

I am an affiliate promoting a vendor’s product at PayDotCom.com
At the vendor’s product sales page, there are 2 kind of options
1) Paypal
2) credit card
When I click on the paypal, it will direct me to the paypal order form but my affiliate name is not appearing at bottom of the page.What is the solution ?
When I click on the credit card option,it will direct me to a clickbank order form and again it will not show my affiliate name at bottom of the page.Clickbank show “Affiliate= None”
Please suggest solution what i will do ? So that my affiliate nick mane will be appear.
Please give me right answer …………