Even though transforming genetically any organism is not an easy task, as it requires the whole organism to be changed, it's more practical to do in a unicellular organism. For example, bacteria mutate very easily due to its ability to incorporate new genes by horizontal transfer. Anyway, unicellular organisms have mechanisms to avoid strange genetic material to get into their DNA, that's why scientists have to use such tools as vectors and more.
Therefore, in order to swim in the English channel, in which its waters are extremely cold, we need carbohydrates like glucose that provide 4 kilocalories per gram. ... Fats are much more energetic foods, producing about 9 kilocalories of energy per gram, more than double that of sugar. Experts recommend that no more than 30% of the calories in our diet come from fat.
