Work has not been done as there is no distance moved. Work done is equal to force*distance
An advantage of sustainable energy is that it diversifies the energy supply and reduces importance on imported fuels.
A disadvantage is that all types of gaining access to sustainable energy requires a lot of space/ land. This may prevent important necessities such as housing to not have enough land. Hope this helps ;)
The answer is C. Watson and Crick developed the Double Helix model seen in the diagram.
