Energy should be the correct answer
The third answer, few mussels developed a thicker shell to protect themselves from crabs found in the region. The change of thickness of shells is an evolution to adapt from the crabs and survive. Further explanation can be read on the research conducted by Aaren Freeman and James Byers. It was learned that crabs release chemicals that are detected by mussels. In turn, mussels have a physical reaction triggered by the chemicals which lead to the thickening of their shells.
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Answer:
Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks.
New farming methods use advanced technology and it is less human labor than the "traditional" farming methods.
Through evaporation water moves from the biosphere to the atmosphere.