Red blood cells, skin cells, and nerve cells in your body all have different, specialized functions. they contain the same genes, so what genetically has caused them to look so different and have such different functions?

The fertilization happens in our body with single cell and our body is form with same set of gene but with starting with single set of fertilized egg.

Explanation:

It reached to trillions of eggs. So, it is not possible to look same. The same thing happens with red blood cells, skin cells and nerve cells. Their size is different according to their work.

In our body the structure of all cell is totally different. Each and every cell is responsible for different work. Their size is according to their suitability of their job. For example, nerve cells are long because it helps to send the signals.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

not sure if this is what you'r looking for eubacteria and archaebacteria