Leaves of Most Deciduous Trees in Mediterranean Ecosystems Open Approximately

Multiple Choice

Leaves of most deciduous trees in Mediterranean ecosystems open approximately 16 days earlier and fall approximately 13 days later than they did 50 years ago.This shift is most likely due to

A) longer day lengths.
B) shorter day lengths.
C) changed behaviors of leaf predators.
D) higher average temperatures.
E) lower average temperatures.