The Prime Meridian or O" is the longitude that passes through the town of Greend south of London. Is the location of 0 Meridian unchangeable?

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast. 

Cpopulation density

There is no map, maybe give the link, it may be b

The correct answer is a)  a resource with a limited supply; it will run out.