Models are frequently used in science to assist in the understanding of complex information. Models can include items like a working volcano, an aquarium, or a stream table. What type of model are each of these items? A. two dimensional B. three dimensional C. mental explanation D. computer simulation

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