If all cells in your body contain the same set of DNA, why is it that some cells become muscles calls, some become skin, or nerve cells?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d