If a molecule is too large to slip through the spaces in the membrane, how will that molecule enter the cell?
a. the molecule will shrink so that it can fit in the spaces.
b. the molecule will move through a protein channel.
c. the molecule will not enter the cell.

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