They classify on how they reproduce.
Photoreceptors convert light into signals that will be sent to your brain.
The are located in the inner part of the eye.
<span>By moving cold and warm water around the globe.</span>
Day and night is caused by the Earth's axis' rotation. The Earth is tilted about 23.5<span>º and every 12 hours or so, it changes every night.
Correct me if I read it wrong.</span>
