It is because all these three elements contain ionic properties and they have only one element in their outermost shell
One-celled (single-celled)
organisms, however, tend to be different from those with many cells.Larger celled organisms <span>such
as plants and animals, have a higher degree of specialization where the cells
work together and function to create a living organism.</span>
<span>rate of technological progress. The steady-state growth rate of total output is equal to the rate of population growth (n) plus the rate of technological progress (g). A change in the rate of technological progress will permanently change the growth rate of total output. </span>