Answer: B... I think
Explanation:
Cell differentiation is how generic embryonic cells become specialized cells. This occurs through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a cell functions.
Answer:
Humans participate in 1 and 3, so the answer is C. We burn fossil fuels and use our respiratory system to produce carbon. We do not, however, go through photosynthesis like plants.
They basically cut the particular region and specified region of the DNA .... this is mainly used in biotechnology ! so answer is first one !