Cellular respiration is a complex process that 1- occurs before autotrophs are able to carry out photosynthesis

2- occurs only in animals that take in oxygen

3- is performed only by organisms that are incapable of photosynthesis

4- breaks down organic molecules to release stored energy

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