Use reasoning to lead to the answer of the following question:
Where is ecosystem complexitiy generally least?\nOptions:\n- (A) humans disturb it\n- (B) frontal zones\n- (C) in lakes\n- (D) at the ocean\n- (E) our planet\n- (F) at the poles\n- (G) mouth of rivers\n- (H) at the equator

(F)
Biodiversity generally increases from the poles to the equator.

Biodiversity contributes to ecosystem complexity.

Ecosystem complexity generally increases from the poles to the equator.

.

So, the answer is (F)