False, That is called the Nail Plate.
A. Warning signs, they can make the person with the illness more ill, they could feel neglected or like no one understand what they are doing and can't see the signs but jn some cases it's the person with the illness that doesn't know like bipolar people might not know they are bipolar until the test.
Common challenges are mental illness and bad self-esteem. Some individuals become depressed, and start having suicidal thoughts, others feel anxious to speak about themselves openly. If society showed more acceptance, individuals may be happier, and will not have as many problems to face.