Cells get rid of waste to sustain the life of the organism. this statement supports which part of the cell theory?
a) cells are the basic unit of life
b) all cells come from pre-existing cells
c) all organisms are made up of one or more cells

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