Which must an animal do in order for cellular respiration to begin? turn energy into sugars eat food gain energy change sugars into food

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

Which statements about mutations are true? check all that apply

This element is solid, forms the backbone of many compounds, and life is based on it. what is it?