Living in a colourful world

I reading about Living in a colourful world.?

1. I learned the primary colours red,blue, and yellow.

2. I have learned people who colour blind they can only see the colour black and white.

3.I have learned that there are seven colours in a rainbow.

4.I have learned that people who colour blind that they are born that way.

5. I have Learned that a lot of animals are colour blind too they can see grey or sometimes as kind of blue or yellow.