Coal itself is not poisonous, but burning coal produces harmful pollutants such as carbon monoxide, sulfur dioxide, and mercury that can be harmful when released into the air or water. In addition, coal mining can also release harmful substances into the environment if not properly managed.
No
yes! eating the nip of pencil is harmful if its made up of graphite
NO.
no
yes I believe it is harmful
The ash
No, eating eggs in not harmful. Though, eating raw eggs could make you sick, but otherwise any form of egg isn't harmful if it doesn't have a disease like salmonella in it.
yes it is but the chemicals will make it is harmful
No it is not harmful but it is likely that they will not enjoy eating it.
grass eating
yes they can, it can be very harmful.