Why does a closed terrarium constantly need light?

Which part of cellular respiration must occur before any of the other steps can occur

10111213141516lactic acid fermentation differs from ethyl alcohol fermentation in thato in ethyl alcohol fermentation co2 is also producedlactic acid fermentation can occur in all living thingsethyl alcohol fermentation can only occur in plantsonly lactic acid fermentation can produce more atp

What factors contribute to the effect an environmental toxin has on the human body?