The virtual assistant in iOS can do all kinds of stuff, of course. But here are the 16 things we think everyone should try at least once.
In most vertebrates and some molluscs, the eye works by allowing light to enter and project onto a light-sensitive panel of cells, known as the retina, at the rear of the eye. The cone cells (for colour) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision.
Euglena use an eyespot to detect light. An eyespot is a dark spot on their body. They cannot see the world around them but they can see light. The eyespot is located anywhere â¦ on their body but usually near their flagella. A flagella is a whip-like strand that euglena and other organisms use to move through the water.