Presenting Dynamic Ecosystem

I'm trying to finish my Biology presentation stuffs and all for tomorrow . But I couldn't really find points to elaborate how does the temperature , humidity , light intensity , PH blablabla or .. what do they call them .. Oh yes yes , abiotic factors .. How do I explain specifically HOW do they affect the distribution of an organism . Hngg . If I don't get this thing in mah mind , Mrs Saliza will point out every single weakness in our presentation tomorrow . SIGH . I need to remember them by heart . SO , what does temperature do that affects the distribution of an organism ? Does it have like something to do with .. most suitable temperature for enzyme to work.. like if the temperature is too high then the enzyme would denatured or something .. I sound silly don't I . Oh My God someone help me how do I explain these stuffs . 4 Science 3 , just .. read this stuff before entering Biology Lab tomorrow okay do me a favour or cikgu is going to kill me . Us . Gah . She has such a bad temper .