It means an organism respire without it
so that organism know as anaerobic
for example : bacteria eats human and animal dead bodies under the earth there O² is deficient so bacteria respire with oxygen O²
If you are unable to see the road ahead while driving through heavy rain or fog, and your wipers do not help, you should p<span>ull off the road completely until visibility improves.
This is the wisest thing to do in such conditions, if you want to avoid having a car accident. If you cannot see ahead of your car when it is raining or foggy, you should avoid driving, because you may injure yourself or somebody else.
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9:3:3:1 would be the expected phenotypic ratio
