When you have corona virus what is the main body system that is being affected? How does it affect other systems?

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart

Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective