because they can carry diseases which can be harmful to humans
Bacteira is found on almost everything even us
Rats can bite us, but they do not poison us. They are not venomous creatures.
Many snakes can be harmful, but they benefit us by eating rodents such as: mice, rats, and etc. that might carry diseases. Spiders can be harmful as well, they benefit us by eating insects like: house flys, mosquitos, and other insects. They keep the bug population at a normal level.
no we can never crreate the rats.
Rats compete with us because rats eat our grain crops.
Because God doesn't like us.
Lab rats helps us by using them to do dangerous experiments. That way we don't have to do it on humans.
some are harmful but some are not harmful
Rats are not allergic to carbon monoxide, but it is toxic to them just as it is to us.
no it is not if they are not babies
Yes, but they are roughly as common there as in major US or other European cities.
on the roof