Question

Pls help A scientist 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 population
Native birds at backyard birdfeeders

Answer 1

Are you sure? the whole question D is: Local backyard birdfeeders without food. Are you sure this is the right one?

Answer 2

Probably D because bird feeders attract birds