Answer:
to be happy and sad depending upon situation
Explanation:
They can read nutrition labels to see how many carbohydrates are in the food.
Answer:
Random changes then created a depression in the light-sensitive patch, a deepening pit that made "vision" a little sharper. Eventually, the light-sensitive spot evolved into a retina, the layer of cells and pigment at the back of the human eye. Over time a lens formed at the front of the eye.
It messes up the cellular system and may mix with others
The Manual of Mental Disorders (DSM-IV-TR). This manual, which at the moment is at its fifth edition (DSM-V-TR), is the standard book by which psychiatric and psychological practicioners diagnose different mental conditions. It is also used as a references for many other practicioners which work in related fields.