The population of worms in a garden ecosystem is decreasing. the population of birds will most likely

increase
decrease
remain the same

The population of birds would Decrease

Explanation:

A birds main source of food  include: Insects, worms, and grubs. Seeds, grasses, and plant material. Nectar and pollen

It also depends on what bird it is but with any species if there main source of food decrease then they decrease or move out of the area.

Hope this helps

it have destructive character