i think maybe carbon dioxide
No, all microbes are not good. Some are very harmful for us . Some microbes such as- protozoa, bacteria, fungi can be bad for our health. Yeast is a type of microbe which we use to make bread.
Some Microbes can help us to live healthily by fighting against other harmful microbes or germs.
I doubt that is even possible, but the answere is no.Microbes help us in many useful ways. Without microbes we would not be able to make certain foods like cheese; or bread. Only certain microbes are capable of making us sick.
We will all gonna be in trouble if these microbes are destroyed because microbes decomposes us and break us down.They will never keep us from accumulating any more.
The air around us help us to breath it carries to the gas that we need but it can also carry bad gases but that is unlikely. the gas we need are oxygen,nitrogen and carbon dioxide.
Oxygen gas makes up just over 20% of the air around us.
Yes, air pollution can and gas from cars
20
to keep us alive
Microbes are present everywhere around us. They are found everwhere in atmosphere, water, and in soil. Microbes like bacteria can grow in any condition and place in the world, either it can be Antarctic or deep in the see. In humans microbes can enter by food, water or air we inhale for breathing. They can also be transfer by some vectors, which, when bite us the microbes get enter in our body in blood. e.g. plassmodium which cause malaria ( a most dreadfull disease in Asian subcontinent) and its vector is anaphilis a female mosquito.
it depends on whether the microbes are visuses causing colds etc. or whether they are benefictial to us.
80 %