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The retina is where all your light-sensing nerves are, including the colour-sensing ones. The eyelid just covers the eye. The iris is the colourful part of your eye but it does not sense colour.

True, many pollinators (like bees) can see colours that humans can’t, such as ultraviolet colours. To attract these pollinators, many flowers have ultraviolet patterns on their petals.

Chlorophyll is the pigment responsible for photosynthesis and it powers this process by absorbing red and blue light. This means it reflects green light back into our eyes.

Red, blue, and yellow are the primary colours when working with paint. Mixing blue and yellow makes green, a secondary colour.

To see a normal rainbow, you need water droplets in the sky opposite to a sun that is close to the horizon. This way, the water acts like a prism and splits sunlight into all its colours.