The color of leaves on deciduous trees usually changes in the autumn season, and deciduous trees are Oak, Elm, Ash, Maple, and Birch. Given these facts, what usually changes in the autumn season among the following options:
- Something that can be auburn
 - looseness of dirt or compost
 - the looseness of soil
 - the color of leaves on oaks
 - a hemisphere is tilted away from the sun
 - Warm air moving into cold air
 - the male sex cells of plants
 - The bending of a ray of light


 

    the color of leaves on oaks     