Certain types of bacteria can be harmful to the environment. Others help with natural processes like decomposing and stuff like that. So, it depends what kind of bacteria you are talking about.
A virus can be harmful to the environment by killing off plants or animals that live in the environment. If enough species die or become ill it can affect the balance in the environment.
Harmful bacteria will harm you. Helpful bacteria will help you.
Bacteria are important in the formation of certain foods. They are also used in mining and bioremediation (using bacteria to clean up the environment). In addition, bacteria that colonize different places in your body out compete other bacteria that may be harmful.
changes both harmful and useful
yes they kill more harmless insects than harmful ones.
They can cause diseases. Another way is that they can invade organisms.
Pretty much everywhere. Its just no harm to you because its minor bacteria. If you are in a very dirty environment, the bacteria that has formed can be harmful or deadly.
Yes. Most bacteria is not harmful to us such as bacteria in a yogurt, but some bacteria is harmful.
There isn't really a "purpose" for harmful bacteria, or anything else, in the scientific sense (perhaps what you really meant to ask was "Why did God/the gods create harmful bacteria?" but then you should have put it in the Religion category). Some bacteria are "harmful" because that helps them spread and reproduce (bacteria that happened to cause coughing or sneezing spread more effectively, and so passed that trait on to their descendants). Some bacteria are harmful as a defense against other kinds of bacteria; a species that can live in a highly toxic environment has at least some incentive to MAKE the environment highly toxic so that they don't have to compete with other species. And some bacteria are harmful more or less "by accident"; they don't derive any real benefit from being harmful, but there's no advantage to them in NOT being harmful either, so there's no evolutionary pressure on them to become either more or less harmful.
Only 1% of bacteria is harmful to humans
not all the bacteria harmful. bacteria that are harmful is i dont know sorry. have a nice DAY!!
If you keep food in a cool environment it lasts longer as the development of harmful bacteria is slowed down.
Harmful bacteria will harm you. Helpful bacteria will help you.
they are not harmful to the environment
the harmful bacteria live in air,human body etc.
Bacteria can make you get a harmful diseese, and you could dye. ( I think )
harmful
There are harmful to all organisms, but some bacteria are helpful in many ways.