PLEASE HELP The diagram below shows a food web in a large park. Each circle represents a different species in the food web.

Which of the organisms in the food web could be referred to as primary consumers?
7 only
5 and 6 only
2, 3, and 4 only
2, 5, and 7 only

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