What has many teeth, but cannot bite?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What Does this text mean:

important=important

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

What has lots of eyes, but can’t see?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?