Fact 1: The color of leaves on deciduous trees usually changes in the autumn season.

Fact 2: Many broad-leaved trees are deciduous.

Given the two facts above, answer the question "On many broad-leaved trees, what usually changes in the autumn season?" with the following options: 
- colors of the spectrum
 - chemical changes
 - color of branches
 - color of leaves
 - temperature
 - shape of branches
 - size of needles
 - bloom time


 

    color of leaves     