usually, the main error is when the friction-feed-roller gets dusty/dirty and is unable to grip the paper to feed through the printer. this can be cleaned by rubbing the wheel with your finger when it stops feeding.
Or getting a foreign object stuck in the feed area and blocking the paper's path.
Why world's population has increased rapidly in last hundred years and main problems will cause?
the people lack of education
Yes, they can. Mutation is one of the four main mechanisms of evolution.
traffic accidents are the main cause of spinal problems so i'd have to say yeah its very possible
There are three main mechanisms that can cause changes in allele frequency.These include natural selection, genetic drift, and gene flow.
Stress form overcrowding can cause a few things.The main thing it can cause is a panic attack.
Chemical and Mechanical
We get spectacles. thats the main cause of sitting in front of any screens .
The main mechanism of adaptive change is natural selection. There are other mechanisms of evolution though Google ' mechanisms of evolution. '
That genetic mutation of chosen stem cells may cause future problems.
the main problems are that it has natural disasters and illegal drugs!
Main problems to be caused can be destroyed homes, schools, public places, killing human beings animals or any living thing and transport being washed away.