Plant: cells: : language:

signs
dialects
ideas
english

Plant:cells::language:dialects. 
The concept of this quiz might seem too complicated, but the point which led me to the answer is the last word. It is like you have to point on the component of the previous thing and language consists of different dialects as well as plants consist of cells.
Hope that helps!

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun