James Watson and Francis Crick
The correct option is D.
Wind has some advantages which makes it suitable as a source of energy but it also possesses some disadvantages which reduces its potentials as a viable source of energy. For instance, large expanse of land will be needed to construct wind farms and this may not be feasible especially in populated areas. Another disadvantage is that electricity production will be depended on the availability of wind, when there is no wind, there will be no electricity.
I'm not 100% sure, but I'd say the availability of vaccines and medicine.
Answer:
tissue
Explanation:
a tissue is a group of cells that work together to perform a common function
