Answer:
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Differential gene expression
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Explanation:
1. Cell specialization occurs due to the differential gene expression, it is the process which is responsible for the production of cells with different traits at different positions and at different time. This process changes cells from simple to more specialized in both structure as well as in function. This is all due to the differential gene expression where all cells beside containing the same gene, express different genes in different cells.
2. Cell differentiation is very important among almost all multicellular organisms. This process results in the formation of a complex organism with different types of tissues and cells from a zygote.
Bottleneck is an example of a genetic drift that happens when the size of a population is severely reduced.
<span> It should absorb the same amount of energy, assuming that the two reactions are exactly opposite.
This is not my answer and the credit goes to the user "</span>Asst Prof" on Yahoo answers I was just merely bringing it to your attention.
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energy flows in bilogical systems with no loss of usable energy when it is transformed</span>
