Well its easy the Bt gene is inserted into one plant cell by using a bacterial plasma.
Starvation.
Disease.
Weather.
Lack of mate.
Offspring dying.
Hunting.<span />
Skin prevents the body from getting infections
<span>Prokaryotes is the answer</span>
Ethanol is produced by yeast under anareobic respiration.
When Glucose is converted into 2 Pyruvic acid yeast converts this into 2 Ethanol and 2 Carbon Dioxide.
Or simply.
C6H1206 + yeast -> 2C2H50H + 2CO2
Enzyme is zymase.
Hope this helps :).