This macromolecule forms pumps and channels within the cell membrane. They act like to let molecules in and out of the cell. - Carbohydrates
- Lipids
- Nucleic acids
- Proteins

dude the first thing it says is that copied answers will get a zero. plus it would take anyone on an incredibly long time to answer. ive seen 2 people asking the exact same question and their questions got taken down. i have the assignment too, and im in the progress of doing it. i suggest going to a more private website, because this is the first place teachers look.

answer; a cost benefit analysis;

answer; independent variable;