Question

which of these is not an example of matter? the sticks in a birds nest the feathers on a bird the air under a birds wings the sound of a bird chirping

Explanation:

Matter is defined as anything that has mass and takes up space. Sticks, feathers, and air all have mass and occupy space, so they are matter. Sound is a form of energy, not matter, as it has no mass and does not take up space.

Answer:

The sound of a bird chirping