How does the Digestive system help to maintain A. Allow organisms to pass on life

B. Act as structure and support for the body

C. Break down food a form our cells can use and absorb

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food