Answer:
The correct answer will be option-D
Explanation:
Stem cells are the cells which have the ability to form different types of cells. They differentiate and specializes to perform different functions in the body and thus forms the different cells.
The differentiation and specialization are controlled at the gene level by different patterns of gene expression. The pattern of gene expression is not fully understood during development but research have shown that the gene expression is influenced by the different environmental signals and internal regulators.
Thus, option-D is the correct answer.
Scientists use ancestors and DNA
Russian and Ukrainian are the languages most likely spoken along the Sea of Azov.
The Sea of Azov is located in Eastern Europe, bounded by Ukraine and Russia on all sides, which is why those two languages are spoken in its vicinity.