So that we can get more oxygen in our body and more carbon dioxide out of our body.
The reason is air filtration. Each nostril has hunderds of hairs and mucous to trap particulate in the air. One nostril would be less effective at trapping since there would be more air traveling through the nostril that would not come into contact with hairs/ nostril lining which has mucous.
4 all together... 2 internal nostrils and 2 external nostrils
They have 2 nostrils.
nostrils
Are 6Because in a trio are 3 people with 2 nostrils each.Is a simple operation 3 times 2 equal 6.
Tigers have 2 nostrils (all land vertebrates only have two; no more and no less).
Because you have 2 nostrils
horses have 2 nostrils.
Its easy 2
A Shetland pony's nostrils are in proportion to its face, so although they have smaller nostrils than, say, a shire horse, nostrils on a Shetland pony do not usually look particularly small for that pony. I have two miniature Shetland ponies, and from memory I would say their nostrils are about 1-2 inches big.
2Two. Like humans.two
Well, snakes have "nostrils" so they need a nose to come out of... :)
Your nostrils are too small. You need to make a tiny slit with a Stanley knife to enable the air to flow in freely.