This is quite homework but i did think about it whilst at school and i wasnt sure where to post it. In the entire electromagnetic spectrum our eyes can only view the visible wavelengths of photons. My teacher said this and it lead me to think why this is so. I've breifly looked on the internet and havent found anything in particular to help me out. So ive got two questions for anybody to answer. Why can our eyes only see the visible wavelengths of the electromagnetic spectrum? And, can other animals or organsims view the other spectrums?