The answer is One solution is to limit the scope of the study. Another possibility
is do several smaller studies over a longer period of time.
The benefits are that you don't have to rely on limited resources and you won't be contribution to global warming but the drawbacks are that you have to find a way to make it run by itself and deal with it not working sometimes.
The answer is B. Warm current
move away from the equator towards the
poles while cold currents concurrently move towards the equator. This
process is known as thermohaline circulation. The cold currents due to higher
density move in the great depth of the oceans
while the warmer currents are on the surface due to their relatively lower density.
