Which factor has the biggest impact on earth's seasons?
a) earth's revolution.
b) earth's elliptical orbit.
c) earth's tilt on its axis.
d) earth's distance from the sun.

The answer is C the Earths tilt on its axis.

I’m sorry i don’t know the answer

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.